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Ultrabook reviews, guides and comparisons

How to Fix Throttling on the Dell XPS 15 9560

By Douglas Black , updated on March 19, 2017

So, you’ve already maxed out your Dell XPS 15 with 32GB of DDR4 RAM and the best 1TB NVMe SSD for the money—now your XPS 15 9560 is as good as it gets, right? Nope, not yet!

Without some hardware and software tweaks, your brand-new XPS 15 won’t be able to perform anywhere near its potential due to throttling.

Before you begin the journey of optimizing your XPS 15, you’ll want the following: 1.5mm 6.0W/mK thermal pads, Thermal Grizzly Kryonaut (best thermal paste at the moment without resorting to the liquid metal variants), some highly pure rubbing alcohol and some microfiber cloths.

As mentioned in our detailed review, the XPS 15 9560 with the Core i7-7700HQ processor is prone to two types of throttling:

  1. Thermal throttling of the CPU or GPU (generally the CPU) when temperatures get too high
  2. Voltage Regulator Module (VRM) throttling caused by it getting too hot and being unable to deliver enough power

The first type of throttling is quite straightforward to all but the most uninitiated: the CPU and GPU have temperature limits to prevent damage. Exceeding the temperature max (100C for CPU, 97C for GPU) will cause an instantaneous shutdown—but you should never see temperatures anywhere near that as the components will throttle their performance long before they get to that point.

There are softer limits than 100C and 97C for the CPU and GPU respectively, however. The GPU will reduce its clocks to keep its temperature below 78C, and the CPU will dynamically reduce its turbo-clocks based on temperatures and power consumption.

The second type of throttling is also the result of heat, but because people generally look at CPU and GPU temperatures alone when benchmarking, it went undetected for a long time.

The VRM’s job is to convert 5 or 12V power from the adapter or battery into much smaller voltages to feed the CPU and GPU (generally 1.5v or less). A VRM has several components, but we are primarily interested in only two: MOSFETS (short for metal-oxide semiconductor field-effect transistor, but you don’t need to know that for any reason except trivia) and chokes. The MOSFET is responsible for switching the voltage down to a manageable level to feed the CPU and GPU; the chokes stabilize the current.

In this image (courtesy of iunlock of Notebookreview), the MOSFETs and chokes have been identified with their temperatures under load. Throttling occurs around 78C.

To get your XPS 15 to run at its maximum potential, we will need to solve both these problems. First, let’s take care of the CPU and GPU heat directly. For this, you’ll need your Grizzly Kryonaut, 99% rubbing alcohol, and those microfiber cloths.

  1. Use a T5 screwdriver to remove the 10 Torx screws around the edges of the bottom panel.
  2. Open the service hatch and use a Phillips screwdriver to remove the two Phillips-head screws.
  3. If this is your first time opening your XPS 15, it will take a bit of effort to take the bottom plate off, as there are many small clips that keep it attached. Get your fingernails or a plastic card under the sides of the base near the hinge where the casing is most robust, and apply even, steady pressure to pull the bottom off.
  4. Remove the battery connector by pulling gently.
  5. Use your Phillips screwdriver to remove the five screws of the heat sink assembly.
  6. DO NOT PULL ON THE PIPES TO REMOVE IT. The heat sink assembly bends very easily. Carefully remove the heat sink assembly by getting your fingers under the upper edges of the left square (this is the GPU’s heat spreader) and gentle pulling upward on the top edge. The assembly should come up fairly easily once you overcome the glue-like suction of Dell’s abominable paste-job.
  7. Use the microfiber with the rubbing alcohol to remove the existing thermal paste. You’ll want to clean both the CPU and GPU dies as well as the heat spreader. Keep cleaning with the alcohol until you don’t see any grey marks on the cloth after rubbing.
  8. Put a little (half the size of a grain of rice) dollop of the thermal paste onto each die. Don’t worry, it will be pressed flat by the pressure of the heat spreader.
  9. Carefully replace the heat sink assembly flat onto the dies. Keep applying firm downward pressure over the heat spreader areas with one hand while you reinsert the screws with the other.
  10. Tighten each screw only a little at a time, taking turns tightening the screw diagonal to it so the pressure on the heatsink is uniform.
  11. Reconnect the battery.
  12. Place the bottom case cover back on the unit. No need to screw it back on yet, though.
  13. Turn on your laptop and run some tests! If you’ve done it right, you’ll see a pretty good reduction in CPU and GPU operating temperatures.

The next step is using software called ThrottleStop to reduce the power consumption of your CPU. This can reduce the load wattage needed for the CPU by 10W easily.

Generally, all the i7-7700HQs on XPS 15 9560’s I’ve seen can undervolt to -125mv for core and cache. I run -125mv on core/care and -75mv on the iGPU.

The final tweak to take care of your CPU and GPU temperatures is to go to the Nvidia Control Panel and change the “Maximum pre-rendered frames” value to “2”. This will prevent the CPU from needlessly being overtaxed to send data to the GPU.

The next step is dealing with the temperatures of the VRM head-on. Take another look at this picture:

Our goal is to cool those MOSFETs with the highest temperature (above the heat spreader) so they don’t hit their throttling temperature. How? We will be using stacked thermal pads to connect the MOSFET to the aluminum bottom cover. Why? When the right type of pads are used, the bottom cover will wick heat away from the MOSFETs.

There is trick to this, and it explains why we use lower performing 6W/mK thermal pads instead of some very high quality ones: if too much heat is transferred to the case it will actually end up heating up the VRM instead of cooling it. This is what will happen if you use an extremely conductive (16W/mK) thermal pad, and it’s why we want the 6W/mK pads for this purpose instead.

The mod is fairly straightforward: cut out small vertical strips from the thermal pad and place them on top of the MOSFETs above the heat spreaders. If you are using 1.5mm thick thermal pads, you will need to stack 3 of them on top of each other in order to reach the case. You want to leave as much open space around the pads so what little airflow there is doesn’t get impeded.

That’s it! Once you have stacked your little padded pillars over the MOSFETs and put the case bottom back on, you should be able to run any game or benchmark without VRM-induced throttling.

After following this guide, your Dell XPS 15 9560 should now be a finely tuned beast of a machine, able to leap mountains in a single bound. If this guide helped you, please let me know in the comments and share this guide.

Douglas is a teacher, mobile tech enthusiast, weightlifter, personal trainer, SCUBA diver, and traveler. He currently lives in Bangkok.


  1. Maks

    March 17, 2017 at 8:40 am

    Wow, that is real tweak!

  2. Etienne Leroux Groleau

    March 17, 2017 at 3:31 pm

    This is awesome! Thanks it's exactly what I was looking for.

  3. Collin

    March 17, 2017 at 5:40 pm

    This is awesome, thanks for putting together such a thoughtfully written guide!
    Do you have any insight on whether these same tweaks would be helpful / worth performing on an XPS 15 9550? Mine has an i7 6700hq and I haven't noticed any thermal throttling or related issues, but I've hardly pushed it to it's full potential either.

  4. Gordon

    March 18, 2017 at 12:28 am

    I'm curious why the VRM would heat up more if too much heat is transferred to the case?

    • Douglas Black

      March 18, 2017 at 12:31 am

      Because if the case reaches very high temperatures, it superheats the air being sucked in for cooling. It will compromise the entire cooling system of the laptop and send temperatures spiraling out of control

      • Physics Works

        March 18, 2017 at 2:24 am

        Wow. That's ridiculous. Might as well make a perpetual motion machine while you are at it. Heat from the VRM can "superheat" (incorrect usage of the word) the air which in turn makes the VRM hotter than it was originally…..

        • Douglas Black

          March 18, 2017 at 2:27 am

          I was referring to heat sinking the CPU/GPU, but using highly conductive mosfet pads will have the same result, as per many people on notebookreview's forums who have tried it. Feel free to sink the mosfets with 16w/mk pads and tell me how well it cools them compared to 6w/mk.

      • Umaaz

        April 11, 2017 at 7:27 pm

        What if you join the VRM to heat pipes with highly conductive thermal pads, instead of bridging them to the case?

        • Douglas Black

          April 11, 2017 at 9:57 pm

          Some have talked about it, you could try!

        • Rouven

          May 4, 2017 at 7:13 am

          Joining the VRM to the case using stacks of 1.5mm pads was causing severe TDP throttling for me. The case was getting really hot, pre-heating the air intake.
          I have now used the same pads to join the MOSFETS to the heat pipes, and it works great. I basically joined several strips to make a path between the other components, pushing the pads down to make sure they do NOT touch the case.

          • Douglas Black

            May 4, 2017 at 7:14 am

            thanks for sharing your results!

          • Jeff

            December 7, 2017 at 5:49 pm

            Can you link to some images of this? I can't figure out how to do this

      • Zhang

        July 29, 2017 at 1:47 pm

        Let me tell you it is wrong.I am not a native speaker so my English may have Grammatical errors.

      • Zhang

        July 29, 2017 at 2:39 pm

        We shall know that in fact the computer is encourage us to heat up the air which is for cooling. Let's just say the computer can breathe in 1 litre of cooling air per second and the computer's thermal power is stable the CPU and GPU is 90 Celsius(194F).First we don't use thermal pads,lets say the cooling system will heat up the air from 20C(68F) to 80C(176F).Then we use the thermal pad which is 16W/mK. This will make the shell in a really high temprature we just say 80C(176F). Yes it will heat the cooling air but actually the cooling air has been heat up twice(shell and inside cooling system) which means when it get out the computer it is hotter than the first time(heat once 80C)which can be maybe 84C(183.2F).We know that only heat from computer makes the air's temperature rise, no matter where it heat up the cooling air,the heat is all firstly come from inside. The cooling air is more hot when getting out the computer means it will take out more heat than before.Which means the computer is cooler than before! And more hot the shell is the more heat will be blow out! So the 16W/mk will work better than the 6W/mk one.

  5. Andrew Gerges

    March 18, 2017 at 6:21 am

    I just bought the 13inch model. Does this have throttling issues also?

    • Douglas Black

      March 18, 2017 at 6:24 am

      just TDP throttling if using CPU + iGPU at the same time. There's nothing you can do about that

      • miran

        April 14, 2017 at 10:01 am

        yes you can using intel xtu up to 25Watt

    • Bernard

      March 18, 2017 at 8:38 am

      My 13 inch seems to get hot every time I load up Steam. I have the Ubuntu version and psensor has reported CPU Temps as high as 100C while running CS GO at QHD+ resolution. It never turned off, I had to turn it off. Regardless, Steam regularly pushes it to 87+C doing nothing. Even YouTube can spike the temperature to the 80's.

      In most cases it's great but in a few cases it cooks. I don't want to RMA it, I spent hours configuring it the way I wanted it. I hope there's an easy solution. I am thinking of getting a better cooling pad, the one I have does nothing. This heat sink stuff sounds good too, but to lose the warranty on the most expensive computer I ever bought is kind of scary.

      • ocramius

        September 26, 2017 at 6:01 pm

        To avoid RMA issues, consider contacting Dell support and asking if you can perform the procedure yourself.

        Make sure to write down/save who is responding, as well as their supervisor.

  6. Reggie

    March 18, 2017 at 10:47 am

    Will this void my warranty and service contract? I've already undervolted my XPS but have held off on opening up and repasting, etc. However, as I read this I'm much more inclined to do so as I would love to extend and maximize the life and use of my super mega awesome machine.

    • Douglas Black

      March 18, 2017 at 10:59 am

      None of this voids your warranty

      • Reggie Generoso

        March 18, 2017 at 1:48 pm

        Sweeeet!!! Thank you for the prompt reply and also this guide! Going to get right on it!

  7. iunlock

    March 18, 2017 at 9:06 pm

    Great write up mate. Keep up the good work. Cheers

  8. Ross

    March 21, 2017 at 10:13 pm

    Any reason not to use liquid metal paste such as Coolabaratory ?

    • Douglas Black

      March 21, 2017 at 10:41 pm

      If you can handle the risk, go for it!

    • miran

      April 14, 2017 at 10:04 am

      The cooling system is not that good for such paste!!

  9. jinny

    March 23, 2017 at 12:51 am

    great tips!
    i have a question. i see a thermal pad under the heatsink. why not change it too?

    • Douglas Black

      March 23, 2017 at 12:55 am

      Those Dell pads are for the VRAM, but they don't need changing. They are very soft, and even .5mm Arctic pads are harder than them. You need them to be soft so they compress easily and allow good contact on the CPU/GPU

      • jinny

        March 23, 2017 at 1:02 am

        what a fast reply! tks
        another Q..
        when i put a thermal pad on MOSFETs should i put thermal pad on all the MOSFET or just like the picture you uploaded?

        • Douglas Black

          March 23, 2017 at 1:04 am

          I don't think that's a good strategy because it will disrupt the airflow which helps cool them. However, some people have done this and claimed good results. I would stick to using little pillars of pads on the mosfets with the highest temperatures so the most cooling is given to the mosfets that need it most.

          • jinny

            March 23, 2017 at 1:08 am

            Then i'll put thermal pad just like you posted!
            I realy appreciate you help :D

          • Douglas Black

            March 23, 2017 at 1:12 am


  10. Jean-Yves Avenard

    March 25, 2017 at 5:06 pm

    For one week I had been trying to understand why it was that my older Gigabyte Aero 14 with its 2.6Ghz i7-6600HQ could be faster than this new Dell with a 2.8Ghz i7-7700hq at compiling Firefox. 24 minutes on the Aero; 28 minutes on the Dell.

    After deinstalling McAfee live (which was disabled); I got it down to 26.5minutes. But that was still too much.

    So I did the trick described above covering the MOSFETs with thermal pads (Arctic 6W/mq).
    And amazingly; it got down to 23 minutes!!!!

    Now that got me surprised.

    I'm not sure that there's any point redoing the thermal paste in the processor. On mine the CPU temp never exceeds 74 degree, even running the CPU at 100% for hours.

    In any case. Thanks.

    You may want to redo the photos however on how to remove the CPU heatsink. The wrong screws are circled, there's no need to remove any of the fans screws. The next photo with the heatsink removed clearly show which 5 screws are to be removed.

    Also; rather than 3 layers of 1.5mm pad; I would use 2×1.5mm+1mm.
    3*1.5mm cause the case to bend slightly between the two screws. You can tell on the photos that it's much too high.

    • Jean-Yves Avenard

      March 27, 2017 at 2:42 am

      Note: undervolting does have a small impact on the performance.

      Here are some results:
      Offset 0V: 24 minutes, max temperature 78C
      -100mV: 24 minutes 50s: max température 72C
      -125mV: 24 minutes 55s: max temperature 68C

    • sLIMshadyKP

      March 27, 2017 at 12:52 pm

      I'll parrot the comments on the photo having the wrong screws circled and the layering of the thermal pads. Two 1.5mm pads are enough to reach the case. I don't know that 3 would cause the case to bend, but 2 is more than enough.

      • Jinny

        March 27, 2017 at 7:59 pm

        Is it okay to put 2 x 1.5mm thermalpad?

        • sLIMshadyKP

          March 28, 2017 at 2:36 pm

          The difference is probably insignificant, but if you're running short on thermal pads, a stack of 2 is enough to reach the case.

          • jinny

            March 28, 2017 at 7:01 pm

            well than i'll try 2 stacks(2mm)

  11. David Kang

    March 28, 2017 at 10:14 pm

    What size thermal pads do you need to cover all those areas? I got 50x50mm. Would that be enough?

    • Douglas Black

      March 28, 2017 at 10:58 pm

      If you cut carefully, yes. I think just enough. But to be save, I'd get 2.

      • David

        March 28, 2017 at 11:05 pm

        would it not fall off if you stack the thermal pads? I just don't want it to fall off when I take my laptop in and out of my backpack or perhaps a bump on the laptop. Or is it pretty sturdy

        • Douglas Black

          March 29, 2017 at 1:33 am

          not if they touch the cover. it will be very stuck in place

      • Jinny

        March 28, 2017 at 11:25 pm

        I'm confused about putting 1.5mm x 3 or 2mm x 2
        what do you prefer?

  12. Rhys Kleinekathoefer

    March 29, 2017 at 1:04 am

    Hi what about covering the ssd?

    • Douglas Black

      March 29, 2017 at 1:33 am

      yes, should be covered already

      • Rhys Kleinekathoefer

        March 29, 2017 at 1:36 am

        Thanks, should the pad be replaced?

  13. Tim

    March 30, 2017 at 7:32 pm


    I haven't ever changed the thermal passte before. Would 1 g of paste enough for both 9560 and Macbook Air? And the way you've used to apply quite risky isn't it? How can I check that the whole surface had been coverred by paste?

    Thanks in advance! That's a great sum-up article.

    • Douglas Black

      March 30, 2017 at 8:06 pm

      It's probably .1g paste on each component.

      It will spread once the sink is closed. If you want to check, open it after pressing for a few seconds and check how the paste distributed. Clean it and paste again accordingly.

  14. Julian

    April 1, 2017 at 10:30 pm

    You make no mention of the black, what looks to be copper, heat shield that covers the vents and the area where the VRM pad would touch aluminum cover. Did you remove it or did you just have the heat pads touch the black shield?

    • Douglas Black

      April 1, 2017 at 10:32 pm

      Do not remove the back shield!!! It is very important that you keep that shield on so the case doesn't get too hot

      • Julian

        April 1, 2017 at 10:38 pm

        Good to know. I'm surprised the thermal pads make a huge difference since they aren't truly touching something that would dissipate a lot of heat.

        Also great write up!

  15. David

    April 4, 2017 at 1:42 am

    So while trying to reapply thermal paste, I bent the heatsink in the middle ever so slightly but I put it back into its original position. I reapplied with the line across on the cpu and the gpu and it seems the idle temps are higher for some reason. Could the slightly bent heatsink have anything to do with the higher idle temps? I'm using MX-4 thermal paste if that helps. Idle temps are 45-50C.

    • Douglas Black

      April 4, 2017 at 1:58 am

      Yes, it will be higher now. I don't think it's fixable, so I would tell Dell you have uneven temperatures and get a tech to come over with a new heat sink.

      • JYA

        April 4, 2017 at 2:28 am

        What idle temperature would you be expecting?

        45C shouldnt be a problem

    • Mike

      April 7, 2017 at 11:17 pm

      Yeah the bent heatsink does indeed affect the cooling. The heatsink itself is very thin and filled with tiny "capillaries" that hold a tiny amount of coolant, and any bending can cause the capillaries to close up even after bending it back. Idle temp of 45-50 deg C is somewhat abnormal btw, I live in a tropical country with ambient temps of 32 deg C and my idle temps on an XPS 15 9550 stock is around 40 deg C

      • Jean-Yves Avenard

        April 8, 2017 at 3:12 pm

        I've looked at 3 9560, all unmodified. All idle around 45C.

  16. David

    April 4, 2017 at 9:27 pm

    What are you getting for your idle temps and browsing web temps? (no youtube)

    • Douglas Black

      April 4, 2017 at 9:41 pm

      37 degrees or so

      • Jean-Yves Avenard

        April 8, 2017 at 3:12 pm

        Is that before or after undervolting?

  17. Jeon

    May 5, 2017 at 12:39 am

    I'm about to buy thermal pad.
    I read all comments and what you writw.

    I'm confused about 2.0 x 2 or 1.5 x 3 which is better.


    • Douglas Black

      May 5, 2017 at 12:48 am

      If their conductivity is the same, I'd go for the 1.5×3 just so you can adjust a bit more easily.

      • Jeon

        May 5, 2017 at 1:09 am

        Okay thanks!

  18. Chris

    May 5, 2017 at 11:53 am

    Curious how well tested all of this is? Does anyone have a good write-up or method for setting a baseline before and after to track improvements?

    I'm running the top model (i7, 4k, 32 gig, 1tb) which is a spendy bit of hardware.

    I'm considering this mod (or something) since my 1yo previous model (9550 or whatever) got so hot the touch pad started to lift up and become useless/broken.

    While Dell should unquestionably have resolved/prevented this problem in the first place I'm willing to do an ~$80 dollar mod like this to fix it if it really works.

  19. Christopher C

    May 26, 2017 at 2:45 pm

    How about the thermal pads under the heatsink because they look thinner. If so, did you use he same product that you used on the VRMs?

    • Douglas Black

      May 26, 2017 at 11:11 pm

      Don't change those under the heat sink. They're very soft and replacing with a harder pad will deform the heatsink.

  20. Osvaldo

    June 5, 2017 at 7:39 am

    Is it ok to use 8 W/mK pads? Or I should use 3.2 W/mK because in my country I can't find those arctic pads 6 W/mK, also what width is ok? 0.5, 1, 1.5 or 2mm?

    • Douglas Black

      June 5, 2017 at 8:22 am

      I think 8 W/mK should be okay. Any thickness is okay as long as the total sum of the number of pads you are using lets them touch the case. Make sure they're rather compressible pads as well, because you don't want pressure on your mobo.

  21. Zeke

    June 15, 2017 at 2:59 pm

    This is great; how would you say this tweak has affected your performance in terms of FPS or other benchmarks, or would you say this change only increases the endurance/stamina of the computer after extended use?

    • Douglas Black

      June 15, 2017 at 9:02 pm

      It should mostly just increase endurance, but some benchmarks will go up, such as uningine heaven

  22. Petersen

    June 15, 2017 at 3:21 pm

    Hi, quick question, i've done all the steps and since then i got my fans basically spinning non-stop pretty much. fans are idle when idle, but when i start web browsing by going through regular pages – the fans will kick in in a matter of 1 minute. Previously the fans were more quiet. Any thoughts why this happens and what can be done?

    i have tried removing pads but this doesn't deliver much.

    • Douglas Black

      June 16, 2017 at 5:52 am

      Check your temperatures. If you didn't repaste and you undid the pads then it's just a coincidence. If your temps are good but the fans are spinning quickly then it sounds like you padded somewhere you shouldn't have that is making a fan sensor trigger.

  23. Petersen

    June 15, 2017 at 4:32 pm

    Dear Moderator, please don't remove my question to the author (again);

    after following the steps from the article exactly as described, the 2 fans keep on spinning almost all the time. Before the change this was much less.

    i've removed pads, but the problem persists. What do you think can be the issue (need to fix it back to original state). Thank you.

  24. Sam Marshallsay

    July 13, 2017 at 11:27 am

    Thanks for the guide!
    I thought I'd give it a go on my old Dell XPS 15 9530 (late 2013) and it seems to work great!
    Obviously not quite the same layout so I figured 'more is more' and covered every visible VRM near the top pipes (carefully) with pads.
    Even in simple games it used to throttle after 10 minutes but it has improved my core temp while under load by 15-20C and I no longer seem to get any CPU or GPU throttling in the games I've tested! (Divinity Original Sin)

    before and after picks here photos.google.com/share/AF1QipMVL7PcB-MP50xMvaV6BLvZip2rpPT-z-bdckyVWRKoB8_CbJ-fLGhhUB24kf3LVA?key=T0Y5YW1RM0VGbjQ2eGdKUGZDQ3otUWxmMDhsLVJn

  25. Zach

    August 25, 2017 at 7:52 pm

    Excellent guide, thank you. However, do the thermal pads go on every number spot shown in the picture


    Or do we just copy how it looks in this shot.


    • Douglas Black

      August 25, 2017 at 9:43 pm

      I would copy how it looks in the shot and see if it still throttles in games

  26. Gerben

    September 13, 2017 at 9:07 am

    So this is pretty good for CPU and with an undervolt of -150 on core and cache and -100 on igpu and system agent, cpu heat issues are nonexistant.

    However, with something like unigine valley, the GPU hits power limit throttling in about 10-15 seconds and the gpu clock goes way down. GPU voltage stays at about 0.750v the whole time with clock around 1Ghz. Something like furmark is even worse, with the power limit kicking in immediately and the clockspeed going down to <600mhz. All the while GPU temps are <65c, cpu temps <50c etc.

    I tried undervolting with Afterburner but the freq/volt curve starts at 800mv so when it downclocks due to power limit, I can't influence the freq/volt curve at all.

    Are you sure the MOSFETs you have shown here are also relevant for GPU power limit throttling?

    • Douglas Black

      September 13, 2017 at 9:49 am

      I don't know if anyone has fixed the GPU PL throttling. What games do you get throttling in (and what is the perf limit reason in GPU-Z)?

      • Gerben

        September 13, 2017 at 10:24 am

        PUBG has some bad performance drops where Pwr shows up as the reason in GPU-Z. I've seen VRef as well when I set cpu max power to ~50% in power scheme. I can try to push cpu undervolt further but it didn't like -200mv last time i tried and -150mv seems pretty good to me already.

        But something like Unigine Valley on lowest settings shouldn't really cause Pwr to kick in either I think, with it getting stuck at ~1GHz.

      • Gerben

        September 13, 2017 at 4:52 pm

        So I did some testing and i'm 99% sure it's the VRAM overheating that causes this.

        I have an IR gun and when I put a blow dryer on cold air up against the VRAM for a minute or two, GPU will happily run at 1.7GHz and the Performance Limit in HWiNFO jumps to "reliability voltage" – which I understand to be the max voltage it gives the gpu to run at max clock.

        Every single Ambient sensor onder DELL in HWiNFO drops below 45c but still gpu does power limit throttling, but the moment i put the fan on the VRAM (specifically the ones closest to the back of the chassis) ambient temps do not matter – it'll stop power throttling.

        So question is what to do, if anything. the stock thermal pads make good contact because the heatsink above the hottest vram chip (below the QR sticker) gets up to 60C easily.


        • Garrett

          January 8, 2018 at 5:45 pm

          Just curious….

          Why is everyone stacking these thermal pads together? Every single manufacturer that actually creates these thermal pads explicitly say: "DO NOT STACK THERMAL PADS."
          "Also, never stack several pads on top of each other. Two or three pads on top of each other between the CPU and a heatsink might kill the CPU."

          I use nice aluminum sticky heatsinks on all the VRAM chips and other chips throughout the motherboard, and I dropped 32C. I do not experience these "throttling" issues everyone talks about.

          Thermal pads are more expensive and have less thermal conductivity than metal heatsinks (aluminum, copper, etc..) .
          Stacking them together like all of you guys are doing, only helps to BLANKET HEAT everywhere and CREATES throttling!

          I dunno where I got this information… Oh yeah… That's right… From all the manufacturers that make the thermal pads!

          • Douglas Black

            January 8, 2018 at 10:13 pm

            You are misunderstand or misrepresenting their information. They clearly state BETWEEN THE CPU AND THE HEATSINK. We are not using pads like TIM, and the fact that this solution lowers temperatures all around proves that there is no danger here.

            Now, using very sticky metal heatsinks or shims are fine, as long as they don't touch the case or have a chance of becoming detached, sliding around your motherboard. That is the main reason I don't suggest everyone use metal shims.

  27. Alex

    September 15, 2017 at 2:26 am

    Would aluminum heat spreaders instead of stacking the thermal pads be better or no?
    something like this

    Just asking cause this guy used those instead of thermal pads on the VRM's

    Im just curious as to which would cool better, thermal pads touching the bottom of the chassis, or sticking aluminum heat spreader on those VRM's?

  28. Tim

    September 23, 2017 at 1:05 pm

    Hi! Thanks a lot for this great guide!
    I still reach 90 degrees on very intensive games on the CPU (small peaks), mostly ~ 80…
    And after 2nd and 3rd time running Firestrike the score goes down from low 6xxx to low 5xxxx…
    Any ideas?
    Xps 9560 FHD i7. Thanks!!

  29. Vince

    October 13, 2017 at 3:41 am

    I am on the market for a new laptop and I am wondering if the same guide have been done for the Asus zenbook pro UX 550 VE.
    This guide almost made me changed my mind to get instead the XPS 15.
    Great review, thank you.

    • Douglas Black

      October 13, 2017 at 3:50 am

      The UX550 has a different problem than the XPS 15. The UX550 simply has an overall underdeveloped cooling solution, which is different from the VRM temperature issues of the XPS 15. Your best bet is to have a professional aftermarket seller like HIDevolution do a liquid metal repaste on yours.

      • Vince

        October 14, 2017 at 5:54 am

        Thank you for the tip, I really appreciate!

  30. gl

    October 27, 2017 at 1:02 pm

    Thanks for the writeup Douglas!

    just did the Kyronaut repaste, VRM pads and undervolting. I didn't see much CPU/GPU (CPU) throttling in synthetic tests before (short runs), but I immediately noticed that after the VRM pads, the fans didn't spin up as much or as quickly on the XTU CPI stress test – nice! Then the extra -0.125V undervolting also made a massive difference, and the paste seems better (my Dell was 2nd-hand and it looked like someone had already done an AS repaste as it wasn't the paler stuff in your pics but a darker AS-like grey & consistency).

    I wonder if it's worth padding a few more MOSFETs though (are they gray ones MOSFETs)? The 78Deg one seems toasty?

    • Douglas Black

      October 27, 2017 at 11:29 pm

      The grey squares are the chokes and should not be padded. If you get throttling after playing a game I would try it, but if it's fine for you then leave it.

  31. MRX

    November 4, 2017 at 10:38 am

    This guide lower my temps from 90°C to 77°C max!

    ty :)

  32. Joe Leigh

    January 1, 2018 at 6:06 pm

    This is awesome!!! (apart from having one of the torx screws strip completely while trying to remove the back and having to drill it out and thread the hole again) this has reduced high load temps from 90 degrees celcius to max 75. Thanks

  33. Giacomo

    January 29, 2018 at 7:59 am

    Wow, this is MANDATORY for anyone having the XPS. Before the intervention, I have monitored the frequencies with i7z, the temperatures with Psensors and used stress to produce high cpu usage.

    Before the intervention, the CPU would immediately reach 90 degress and throttling sent the CPU back to 800 MHZ. With "immediately", I mean max 10 seconds. I could not have the CPU run at max throttle for longer than 10 seconds!!! This is incredible.

    After changing the paste (and I only had an MX-4 available), the CPU is stable at 77-78 degrees, with no throttling, and the fan is not even at max. This is on since already 10 minutes …

    Awesome man. I owe you one.

    • Douglas Black

      January 29, 2018 at 8:05 am

      Very welcome, Giacomo!

    • Timothy

      February 8, 2018 at 4:35 am


      Did you apply the thermal pads as well replacing the thermal paste? I’ve owned xps (08’) before and need a new machine after this weekend, the idea of having to mod a factory fresh kinda bums me out..

      Great post OP, seriously.

      • giacomo benelli

        February 8, 2018 at 5:09 am

        Hi Timothy, yes I did, once you have opened everything it makes sense to do it all, even though I think you get the most benefit from the thermal paste on the CPU/GPU.

        Overall, I was not very keen to open it myself, my XPS is from December. If you want my opinion, I am slightly disappointed by the XPS. This throttling problem alone is enough to piss you off, but on top of this I got the suckier nvme SSD ever (hynix), an almost unusable keyboard (if you press on tab a little bit harder, it flexes and interferes with the underneath cooling fan!!!) and the "killer" wifi card that is just broken and I had to replace with an Intel 8265.

        This is too much to handle on a 2800 euros PC (with docking)!!!!

        My advice, if you are alright with doing these mods yourself, and you need a laptop NOW, get the XPS, it is still a great PC under many aspects. If you can wait though, try to get a 2018 model that (guess what?) sports a brand new cooling system, amongst the others.


  34. Antonio

    February 13, 2018 at 11:24 am

    Hi all.
    After a lot of research in this matter I needed this throttling issue resolved. I use my xps 9560 for AutoCad with no issues and light gaming. Csgo only. Before after 30/40 min my fps drop from 120 to 30 which is not playable at all.

    So my mod was.

    Undervolting -100mv on CPU
    Undervolting -85mv on iGPU
    Adjust the Gpu curve with msi ab, raising the frequency when on low voltage and continuously to higher frequencies.

    Repaste and thermal pads on VRM.


    Now I play over 3H non stop with constant 170fps occasionally dropping to 120/130 for 10 sec. Max temperatures reached are 68/70c on gpu and 80/85c on cpu after 1H playing. That quite an improvement for me at least. Thanks for all the tips.

  35. Ze

    February 22, 2018 at 3:43 pm

    Hello Douglas,

    I've been exploring ways to fix the thermal throttling issue with the i7 in 9550 for a while. After reading your article and watching https://youtu.be/hdTsra-uLBI from Linus Tech Tips; do you think it is fine to use liquid metal? What is that black stuff around the copper heatsink? I guess the most important question is the heatsink complete copper and will liquid metal cause corrosion on it or around it with the black shield surrounding the die.



    • Douglas Black

      February 22, 2018 at 8:14 pm

      The problem with the XPS 15 series is the vrm cooling, not cpu temperature. You can LM the XPS 15 but it won't help the main issue.

      • Ze

        February 22, 2018 at 8:56 pm

        Thank you!

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