As of late August 2017 Intel announced the first quad-core eight-thread platform designed for ultra-portable computers. The CPUs in this line are sold as 8th generation processors, although in reality they are an update of the 7th generation hardware line and are called Kaby Lake-R (efresh). According to Intel’s new naming policy, the 8th gen series includes these KabyLake-R CPUs already released, but also the Coffee Lake and Canon Lake CPUs that will be released in the future. However, that shouldn’t matter much to you as a potential buyer.
The platform’s particularities on the other hand should, and we’ve already spent time with two laptops (Acer Spin 5, Asus Zenbook UX331UN) built on the entry-level processor of the 8th gen line, the Core i5-8250U. The paragraphs below include our impressions, benchmark results and comparisons to the existing Core i5-7200U and i7-7500U CPUs.
But first, here’s what you should know about the Kaby Lake-R platform. It includes 4-core 8-thread Core i5 and i7 processors built on a revised 14+ nm lithography, with a TDP of 15 W and support for up to 32 GB of up to DDR4-2400 memory. They also integrate the same Intel HD 620 graphics chip that’s part of the dual-core KabyLake processors. However, in order to accommodate the 2x number of cores, the default speed per core is lower on the quad-core models, with Turbo Speeds compensating for that with most loads, and as you’ll see below that’s both a fast performing and an efficient solution.
The Kaby Lake-R CPUs will make it into a large numbers of ultraportable laptops and mid-tier full-size notebooks, with or without dedicated graphics. We compiled a full list of all these laptops in this dedicated article.
With that in mind, let’s get to the main topic of this article, the Core i5-8250U processor. You’ll find the important technical specs below.
And here’s how it compares to the dual-cores and the Core i5-7300HQ, the closest quad-core alternative available until now.
| i5-8250U (Ark) |
i5-7200U (Ark) |
i5-7300HQ (Ark) |
i7-7500U (Ark) |
|
| Litography | 14 nm | 14 nm | 14 nm | 14 nm |
| TDP | 15W | 15W | 45W | 15W |
| Cores/Threads | 4/8 | 2/4 | 4/4 | 2/4 |
| CPU Base Frequency | 1.6 GHz | 2.5 GHz | 2.5 GHz | 2.7 GHz |
| CPU Max Turbo | 3.4 GHz | 3.1 GHz | 3.5 GHz | 3.5 GHz |
| Cache | 6 MB | 3 MB | 6 MB | 4 MB |
| Max Memory |
32 GB | 32 GB | 64 GB | 32 GB |
| Graphics | Intel HD 620 | Intel HD 620 | Intel HD 630 | Intel HD 620 |
| Graphics Speed | 300- 1100 MHz | 300- 1000 MHz | 350- 1050 MHz | 300- 1050 MHz |
| PCIe lines | 12 | 12 | 16 | 12 |
| Price | $297 | $281 | $250 | $393 |
Alright, so compared to the i5-7200U and the i5-7500U, the newer i5-8250U has two more cores and four more threads, more Cache memory and slightly faster Intel HD 620 graphics capable of reaching marginally higher Turbo Speeds. The base CPU frequency on the other hand is much lower, but the Turbo Speeds are comparable or improved over the dual-core i5s and i7s, and that’s why the i5-8250U is a match for the dual-cores in terms of single-core performance and a big step-up in multi-core activities. More about that in a bit.
Compared to the i5-7300HQ, the i5-8250U is a lot more efficient, gets four more threads and more cache. As far as performance goes, well, here’s what to expect.
While I don’t believe synthetic benchmarks make much sense for real-life use, they’re the best way to actually fair these CPUs one against the other. We ran a couple of CPU benchmarks, and the results are below.
| CPU Benchmarks | i5-8250U S1 |
i5-8250U S2 | i5-7200U | i5-7300HQ | i7-7500U |
| Cinebench R15 CPU | 486 cb | 527 cb | ~326 cb | ~512 cb | ~338 cb |
| Cinebench R15 CPU – Single Core | 136 cb | 143 cb | ~128 cb | ~142 cb | ~143 cb |
| Cinebench R11.5 CPU | 5.66 pts | 5.98 pts | ~3.7 pts | ~5.7 pts | ~3.8 pts |
| Cinebench R11.5 CPU – Single Core | 1.58 pts | 1.64 pts | ~1.5 pts | ~1.5 pts | ~1.7 pts |
| Geekbench 4.0 – Multi Core | 12243 | 13220 | ~6790 | ~9300 | ~8070 |
| Geekbench 4.0 – Single Core | 4194 | 4053 | ~3630 | ~3720 | ~4150 |
| Passmark – CPU test | 7920 | 7945 | ~4600 | ~6800 | ~5200 |
| x264 HD Benchmark 4.0 – Pass 2 | 30.4 fps | 42.23 fps | ~21.6 fps | ~32.3 fps | ~21.6 fps |
| x264 HD Benchmark 4.0 – Pass 1 | 137.93 fps | 156.24 fps | ~113 fps | ~155 fps | ~117.1 fps |
| 3DMark – FireStrike Physics | 7441 | 7918 | ~4640 | ~6370 | ~5430 |
The i5-8250U results are based on two review units (S1, S2) we’ve spent time with. Keep in mind they’re both pre-production samples and these numbers might actually improve with better optimized drivers down the line. Both worked fine though and I’m comfortable to say that’s mostly what we should expect from this CPU.
The other results are based on our reviews and the averages for those CPUs from notebookcheck.net, as they have a larger pool of reviews in their database.
Overall, the i5-8250U improves on all the dual-cores on multi-core performance and it beats the i7-7500U in terms of single-core performance in most tests. It’s neck in neck with the i5-7300HQ CPU in multi-core benchmarks though, despite having four extra threads, and that’s because the i5-8250U cannot maintain 3.4 GHz Turbo Speeds in continuous full loads (Cinebench, x264 Bench). I noticed the same behavior on both our samples, as you can see in the pictures below.
The CPU maintains high Turbo speeds for a short while, which is corroborated with a package TDP of 25 W or higher, but after a few seconds it drops to the standard 15 W TDP and the frequencies drop to 2.2 – 2.3 GHz.
That means that if you need the best option for multi-core performance, the 45 W Core i7 HQs are still the ones to get right now, but the i5-8250U is there next to the i5-7300HQ in most cases, while requiring a third of the power.
We also ran a couple of GPU benchmarks for the Intel HD 620 chips on the i5-8250U configurations and we’re comparing the results to the average HD 620 results from notebookcheck.net.
| GPU Benchmarks Graphics | HD 620 S1 | HD 620 S2 | HD 620 average |
| 3DMark 11 | P1741 | P1862 | P1628 |
| 3DMark – FireStrike Graphics | 1017 | 1021 | 916 |
Nothing unexpected here, the results on the i5-8250U are a little higher than the norm, as the chips can reach slightly higher Turbo Speeds.
There’s also the topic of gaming on an the i5-8250U configuration to discuss, but I can’t draw any firm conclusions based on our two samples. What I can tell you is that the CPU wasn’t be able to maintain 3.4 GHz speeds in recent games on either of the units, with a significant drop on the configuration that relied solely on the i5-8250U and the Intel HD 620 integrated chip (S1 in the pics below), and a smaller loss on a configuration that came with dedicated Nvidia graphics on the side (S2 in the pics). That makes sense, as the GPU integrated withing the processor is inactive in this latter case and as a result the actual cores can run at higher frequencies, not having to share energy with the GPU, within the TDP restrictions.
I’d reckon you’ll also be interested on the matters of temperatures, noise and battery life for the KabyLake-R configurations, and while I don’t want to generalize and I encourage you to read the specific reviews for the devices you’re interested in, I can say that these are on par with what we’ve seen on dual-core Kaby Lake builds in the last year.
Wrap-up
With all these in mind, if I were in the market for a high-performance ultraportable right now, I see no reason why I wouldn’t pick one of the KabyLake-R models. I would note that I can’t yet conclude on the gaming experience, due to the drop in core speeds we noticed on one of our samples, but if I were into gaming I wouldn’t rely on the Intel HD graphics anyway, but rather go with a thin-and-light with dedicated Nvidia graphics.
For everyday multitasking and demanding loads that put stress on the CPU though, the KabyLake-R Core i5-8250U is an obvious pick over the dual-core i5-7200U and i7-7500U, but also a better balanced and much more efficient alternative to the quad-core i5 HQ processors. The i5-8250U is also just a tad more expensive than the i5-7200U and about $100 cheaper than the i7-7500U, so configurations built around it should have a pretty fair price as well.
Of course, the i5-8250U is just the entry level chip in the KabyLake-R series, with higher clocked i5s and i7s also available for those interested in even more power in this small and efficient package. I’ve yet to spend any time with these for now, so we’ll talk about them in future posts.
Bottom point, the quad-core Core U CPUs are one of the most significant upgrades we’ve seen on thin-and-light ultraportable laptops in the last years, and they’ll make their way into a bunch of devices in the second half of 2017 and later on. Here’s a full list, and stay around for reviews and updates. That aside, the comments section is wide open, so get in touch if you have anything to add, any questions or any feedback.
Mandy
January 24, 2019 at 5:09 pm
Hi Andrei,
I'm looking at this laptop:
https://www.officedepot.com/a/products/3982316/Acer-Spin-5-Refurbished-2-In/
My main use would be editing photos in Lightroom and Photoshop (not running both programs at the same time. Would this laptop be suitable for this purpose? Adobe's website says minimum system requirements are "Intel® Core 2 or AMD Athlon® 64 processor; 2 GHz or faster processor" and I know this is only 1.6 GHz. Any guidance would be greatly appreciated!!
Andrei Girbea
January 24, 2019 at 11:08 pm
I cannot access office depot here in Europe. Can you give a brief specs list: CPU, RAM, Storage? Also, price?
D.
February 19, 2019 at 11:06 pm
Hi Andrei,
I'm awaiting delivery of this setup:
"2018 HP 17.3 Inch HD+ High Performance Laptop | Intel Core i5-8250U Quad Core | 16GB DDR4 | 256GB M.2 SSD+ 1TB HDD | Intel UHD Graphics 620 | Backlit Keyboard | Webcam | Windows 10 | Gold color "
amazon.com/gp/product/B07FXLNVKV/ref=ppx_yo_dt_b_asin_title_o00__o00_s00?ie=UTF8&psc=1
Aside from the usual multi-tabbed browsing and Netflix streaming, I dabble in photoshop and use MS Office for work-related things and python coding in an IDE. I'm assuming this will run quickly even when all done together, and hope the SSD as the boot drive will keep startup quick. Thoughts?
I'm a little more concerned about draw speeds using geographic information system (GIS) software like QGIS or ArcMap. Do you have any familiarity with those and how this system might handle them? (no 3D modeling will be done)
Andrei Girbea
February 20, 2019 at 11:32 am
I'm not familiar with those pieces of software, but I think the i5 should handle most loads well. Just make sure to give it a proper test within the return window, just to make sure everything runs as you want.
Steve Oldfield
March 15, 2019 at 8:25 pm
Hi Andrei
A great article and the replies thread makes interesting reading. I am looking to upgrade my old Samsung Series 9 (i5-3317U) to an Asus Vivobook S14 or S15 which will only be used when travelling for image editing (perhaps maybe stitching a panorama) in Lightroom/Photoshop. Will the i5-8265U CPU rather that the i7-8565U be sufficient for my needs? I will be upgrading the RAM to 16/24 GB on purchase.
Roy
May 13, 2019 at 9:19 pm
Hello….Can you help me in making a selection?
Should i go for Core i5-7300U (Microsoft Surface Pro 5) OR Core i5-8250U (Microsoft Surface Pro 6) for music production and live performances? I use VSTs like OMNISPHERE,KONTAKT…..My DAW is CUBASE/ABLETON LIVE.
Much appreciated.
Andrei Girbea
May 14, 2019 at 10:09 am
I'd get the 8250 if within budget, just make sure the laptop you're interested in able to properly cool it and get the best performance out of it
Roy
May 14, 2019 at 4:02 pm
m planning for the surface pro series for my live performance…….surface pro 5 cpu is a core i5-7th gen DUAL CORE processor with higher base frequency (2.6Ghz), while surface pro 6 is a core i5-8th gen QUAD CORE processor with lower base frequency (1.6GHz)…….For my purpose , which one do u think is best for me…………JUST to let you know, i am on a budget here and so the i7 processors have not been mentioned………the VSTs i use are OMNISPHERE, KONTAKT………….in Ableton Live/ Cubase
Andrei Girbea
May 14, 2019 at 4:20 pm
The 8250 gets lower base-clocks, but it actually runs at higher Turbo CLock speeds in pretty much every implementation, so it will offer a significant performance increase in most scenarios.
I'm not familiar with how well those pieces of the software handles multiple cores, or whether they rather favor higher clocks, but even so I'd still probably go with the 8250. I would, however, advise you to further look on this matter, namely how they handle multi-core load balancing.
Mark Reid
August 18, 2020 at 3:21 pm
Hi Andrei
I am buying a new desktop and thought the Medion Akoya E23401 All-in-one might be good option. It has Intel Cote i5-825OU; 2TB + 256GB SSD, 8GB RAM.
I would like to use for video streaming. Office applications and some graphic design or video editing so would run apps like Adobe Photoshop or GIMP and Adobe Illustrator (or similar); Filmora or Windows Movie Maker.
Is the Medion AKoya E23401 a good option or would you recommend something else?
Wonderful review by the way. So In depth.
Thanks and kind regards
Mark
Andrei Girbea
August 19, 2020 at 10:38 am
Sry, I haven't touched that so can't comment on it. I'd suggest finding some reviews, if available. For what is worth, Adobe software is going to be a challenge for this hardware.
Mark Reid
August 19, 2020 at 1:53 pm
Hi Andrei,
Thanks for your prompt reply. I have r ead some reviews and they are good. It gets 8.4/10 or 4.5/5 stars. I think it will support my needs as it’s not like I will be using Pshop or Illustrator a lot. Just the odd time.
Just curious though as my daughter does graphic design, so what spec hardware would you recommend for Adobe Creative Cloud software?
Many thanks
Mark Reid
Andrei Girbea
August 19, 2020 at 4:11 pm
Depends on the kind of laptop she'd prefer. Normally, the more powerful specs the better, but those are either expensive products or/and larger form-factors. If she'd prefer something more portable, I'd look into something based on AMD Ryzen 4800HS/4900HS of withing budget, or an AMD Ryzen 4700U platform. I'd also recommend 16 GB of RAM and decent SSD storage.