Skip to main content

Surface Laptop Core i5 vs. Core i7: Comparing performance, battery life and more

Surface Laptop
Surface Laptop

The Surface Laptop is Microsoft's latest foray into PC hardware, and reviews across the board have been overwhelmingly positive ... except for price considerations. If you noticed one consistency in those reviews it was the similar processor – Core i5-7200U with Intel HD620 graphics – that was tested.

I was curious, however, about how the Core i7-7660U version stacked up regarding performance, battery life, and fan noise. Here is what I found.

Surface Laptop Core i7 performance comparison

The Surface Laptop with Core i7 starts at $1,599, and it features 8GB of RAM and 256GB of storage, just like the specs in our Core i5 review unit. There is also an i7 version with 16GB of RAM and 512GB of storage for $2,199 that should be available on June 30.

See at Microsoft Store

The two main differences between the Core i5 and Core i7 are clock speed for turbo frequencies and the more powerful graphics with the Intel Iris Plus 640, both of which make the Core i7 well suited for power users. The cost difference is $300 between similar models for the extra RAM and storage. Part of that price difference is the Core i7, which has a suggested price of $415 versus the $281 for the Core i5.

Surface Laptop Core i5 vs. Core i7

CategoryCore i5-7200UCore i7-7660U
Number of coresTwoTwo
Number of threadsFourFour
TDP15 W15 W
Base frequency2.50 GHz2.50 GHz
Max turbo frequency3.10 GHz4.00 GHz
Cache3 MB SmartCache4 MB SmartCache
GraphicsIntel HD 620Intel Iris Plus 640

When it comes to graphics, the Iris Plus 640 has double the execution units – 48 – and features 64MB of eDRAM. The eDRAM is a big deal for performance and is completely lacking with the Intel HD 620. That eDRAM also is likely what drives up the cost of the chip because that memory is not cheap. Likewise, the Graphics Max Dynamic Frequency jumps from 1.00 GHz to 1.10 GHz with the Iris Plus 640. All of that effectively doubles the floating-point operations per second (FLOPS) from 384 to 730 in favor of Iris Plus. (Floating point operations are used for computing scientific or real-time processing applications that crunch extremely long numbers).

CPU

Taking a closer look at Geekbench 4.0, which is more CPU-heavy than graphics-heavy, you can see a significant jump in performance between the Surface Laptop Core i7 over the Core i5 variant. Just as interesting is how the Surface Laptop's Core i7 slightly outperforms the Surface Pro (2017) with a similar configuration. That difference is likely due to more aggressive power throttling (more on that below).

Geekbench 4.0 benchmarks (higher is better)

DeviceCPUSingle coreMulti core
Surface Laptop i7i7-7660U4,7149,535
Surface Pro 2017i7-7660U4,5139,346
Surface Booki7-6600U3,9777,486
Surface Laptop i5i5-7200U3,7257,523
Surface Pro 4i5-6300U3,3196,950

GPU

While the Core i7 is faster than the Core i5, you see a bigger gap on the OpenCL test that looks at graphics performance.

Geekbench 4.0 OpenCL (higher is better)

DeviceGPUCompute score
Surface Laptop i7Iris 64031,010
Surface BookGTX 965M64,108
Surface Pro 2017Iris 64030,678
Surface Laptop i5HD62019,256
Surface BookHD52018,197
Surface Pro 4HD52017,395

The Intel Iris Plus 640 (31,010) makes significant gains on the HD620 (19,256). While Iris Plus is not as powerful as a discrete GPU, it rivals the NVIDIA GT-940M (28,868), even beating it slightly. Nonetheless, for gaming, the discrete GPU will perform better overall due to greater memory and bandwidth – see, for example, how the Surface Book with Performance Base (GTX 965M) doubles the Iris Plus for OpenCL. For short, intensive tasks the Iris Plus is excellent, especially for productivity.

CPU & GPU

PCMark (Home Conventional 3.0)

DeviceScoreComparison
Surface Laptop i73,156Better than 62 percent of all results
Surface Pro 2017 i73,055Better than 57 percent of all results
Surface Laptop i52,494Better than 40 percent of all results

Again, for PCMark, the Surface Laptop with Core i7 beats all other mobile Surfaces including the similarly configured Surface Pro.

SSD

For those hoping the Core i7 version of the Surface Laptop would use a more powerful storage option, you will be disappointed.

CrystalDiskMark (higher is better)

DeviceReadWrite
Surface Laptop i7486 MB/s244 MB/s
Surface Pro 20171,284 MB/s963 MB/s
Surface Book1,018 MB/s967 MB/s
Surface Laptop i5423 MB/s237 MB/s

Microsoft is using the same Toshiba (THNSN0256GTYA) solid-state drive (SSD) as the Core i5 variant at 256GB. It is not yet known if the 512GB Surface Laptop has a different drive, but since SSDs usually scale up in performance based on size, even if they're the same type, it should be faster than at 256GB.

Real-world usage for running apps, games, and the OS feels fast with the Surface Laptop's SSD, so it's not a problem unless you do large file transfers. Microsoft faced new constraints with the Surface Laptop because storage, for the first time, is directly integrated into the motherboard instead of a separate module. That choice was made to save space, power, and add a larger battery. The tradeoff seems worth it.

Overall, there are no caveats or surprises here. The Surface Laptop with Core i7 outperforms the Core i5 version significantly for both CPU and GPU. The Laptop's higher scores compared to Surface Pro likely have to do with more agressive power limit throttling in the Pro due to its thinner and more compact chassis. Let's now turn to throttling to see what happens there.

Surface Laptop Core i7 stress test and throttling

CPU thermal management is always a challenge, so the question of whether Microsoft is purposefully limiting the Core i7 on the Surface Laptop is a legitimate one.

To find an answer, I ran Intel XTU's stress test for 30 minutes on both the Core i5 and Core i7 Surface Laptops. Both power sliders were set to "Best Performance" with AC power to ensure the processors were maxing out.

Microsoft is certainly not thermal throttling the Core i7 or Core i5, but there is some occasional power limit throttling. Power limit throttling (a.k.a. PL1) can be thought of as a skin temperature test that ensures the Surface does not get too hot to touch. It's dependent on the manufacturer – Microsoft – setting an upper limit on how hot the Surface (versus the processor) should be allowed to get before the system reduces the power draw, reducing overall CPU speed.

Intel XTU 30-minute CPU stress test shows no thermal throttling, but occasional power throttling to keep the chassis from getting too hot.

Thermal throttling, however, is a reaction to extreme CPU temperatures. Once the CPU hits an upper limit, it reduces power to lower the processor speed and drop temperatures. Likewise, processor thermal throttling can have severe oscillations in performance, whereas power limit throttling is more consistent.

It is important to note that almost all laptops do this to some degree. PL1 is also the reason why some people use a USB fan to cool the back of the Surface Pro. The limit is entirely dependent on the room temperature and how hot the laptop gets. By cooling the outside of the Surface, you can stave off the effects of power-limit throttling.

The result is the Core i7 running at 100 percent CPU usage in a room about 78 degrees F (26 degrees C) maintains between 3.2 GHz and 3.6 GHz, which is quite good. The Core i7 is rated for 15W TDP (but can turbo higher), and it fluctuated between 11W and 16W during the entire 30-minute test.

Had I done the same test in a cooler, air-conditioned room, the results would have been even better due to the Surface Laptop chassis's ability to dissipate more heat efficiently.

Heat and fan noise with the Surface Laptop Core i7

It should not be shocking to learn that the Surface Laptop runs hotter when configured with a Core i7 CPU versus the Core i5 model.

Surface Laptop peak temperatures

CategoryCore i5-7200UCore i7-7660U
Bottom of laptop104° F / 40° C113°F / 45° C
Keyboard deck102°F / 39° C108° F / 42° C
Exhaust vent113° F / 45° C120° F / 49° C

The Core i7 Surface Laptop gets significantly warmer on the aluminum bottom, keyboard deck and of course at the exhaust vent. While the temperatures were never extreme, the Core i7 after thirty minutes of 100 percent CPU usage – an unlikely scenario – pushes out more heat compared to the Core i5.

While you may not want to use the Core i7 Surface Laptop while wearing shorts during a 30-minute stress test, at least under regular usage there is no significant difference between the two. Both laptops easily stay well below 100 degrees F (38 degrees C) and are comfortable to use.

The Core i7 Surface Laptop does get warm under 100% CPU load, but never too hot.

For fan noise, the Core i7 is louder. While not as irritating as the Surface Pro 3 or Surface Pro 4's infamous "hiss," the fan was audible from three feet away during the 30-minute stress test. The Core i5 version, however, is still ridiculously quiet often requiring you to put your head near the exhaust just to hear it, even under load.

In real world usage, both laptops are inaudible when browsing the web, using Windows Store apps, or doing productivity work. Even when under CPU load, like when playing a game or doing some light video editing, both laptops will be some of the quietest on the market. Nonetheless, if you value silence, the Core i5 version is an excellent choice because it almost seems fanless.

Surface Laptop Core i7 battery life is great

Testing battery life on a PC is rather difficult due to the extreme stepping technology that Intel uses, making it very task dependent. If running the processor at 100 percent you can run out of power in just a few hours. But that is not how most people use laptops.

I did not find a radical difference in battery life with the Core i7 Surface Laptop compared to the Core i5 model. That result is likely because the type of computing I do – web browsing using Edge, writing in Microsoft Word, running Windows Store apps like Twitter, Adobe Photoshop Elements, Slack, and GroupMe – do not cause the i7 to run on the 4.00 GHz ceiling for long durations.

For real-world usage, the Core i7 lasted me around eight hours, sometimes more, at 40 percent screen brightness and connected to Wi-Fi. Like the Core i5 version I never felt I had to carry the AC adapter – even if it's adorably small with this generation of hardware.

Microsoft claims 14.5 hours of life, but that is a looped video test with no network connectivity. Companies do this for one reason: it's a repeatable claim. Anyone can re-run that test and get the same result, whereas real-world usage varies widely by the user.

Going to the other extreme is a run-down battery test like PCMark. That test, when set to accelerated, uses the CPU and GPU to continuously run looping tasks like photo editing, video chat, web browsing, and more, until the battery hits 20 percent. Here the results were surprising. With both displays set to 50 percent brightness and "recommended" for power usage, these are the results:

PCMark 8 Home Battery Accelerated

CategoryCore i5-7200UCore i7-7660UBattery consumption
TimeFive hours and one minuteFive hours and fifteen minutes81 percent

In a battery run-down, the Core i7 lasted slightly longer than the Core i5 model. The result may be because the Core i7 just accomplishes its tasks faster, spending less time at peak turbo. The Core i5 and Core i7 also have similar base clock speeds. Keep in mind that the battery on both devices still had 19 percent left and could have squeezed out another hour or more, especially in battery saver mode.

The bottom line is the Core i7 Surface Laptop gets comparable battery life to the Core i5 model assuming you're not running it at 100 percent CPU for 100 percent of the time.

Surface Laptop Platinum

Conclusion: Surface Laptop with Core i7 is truly impressive

In testing the Surface Laptop with Core i7-7660U, there is good news all around. The processor performs significantly faster than the Core i5, which is only sweetened by the excellent Iris Plus 640 for graphics.

Under extreme duress, the Core i7 held up well at an average of 3.5GHz, and while the external temperatures were noticeably warm, it was never scorching.

Fan noise is louder, but still well below some other current laptops in the same class. During regular usage, the i7's fan was quiet and only kicked in when CPU usage sustained at a high rate for more than few minutes.

Full Surface Laptop review

Finally, for battery life, the Core i7 and Core i5 models are similar in real-world use, and in synthetic benchmarks the Core i7 can even outlast the Core i5, albeit by a small margin.

Whether the Surface Laptop with Core i7 is worth it is another debate. For most users, the Core i5 model is perfectly fine. It delivers cooler thermals and a quieter fan (despite how rarely it comes on) – and it does all of that at a significantly lower cost.

People who need a Core i7 processor know it – they're graphics pros, engineers, or just like to have the fastest model available. For those folks, the Core i7 is an excellent choice as I found no fatal flaws with it versus the Core i5 model save, for the lack of color choice for the chassis. There is only Platinum, for now, with the Core i7 models. However, I am told Microsoft Stores will have the 16GB version in all four colors soon.

See at Microsoft Store

Daniel Rubino is the Executive Editor of Windows Central, head reviewer, podcast co-host, and analyst. He has been covering Microsoft here since 2007, back when this site was called WMExperts (and later Windows Phone Central). His interests include Windows, Microsoft Surface, laptops, next-gen computing, and arguing with people on the internet.

52 Comments
  • Can we expect similar performance from the Surface Pro?
  • Working on that article now. Look for it Monday.
  • Oh that's awesome. I'll look forward to check it out
  • Awesome. This is exactly what I wanted to know.
  • Same comment for me: awesome. I was a bit disappointed that Microsoft sent the core i7 SP to every reviewer as I'm interested in the i5 but you managed to get both...well done!
  • Because everyone wants to know, how does the i5 do with the fanless setup.
  • But will it play Crysis?! 😁
  • Easily.
  • Great! But what about some benchmarks for performance. Compare it with previous surface and iPad pro as well.  In a video by Austin evans, he claimed that iPad pro has a better bench marks then surface pro i5 2017. Is he right? I wanna know badly;")
  • Austin is a bit wrong on that as Geekbench is coded differently between iOS and Windows making the results not directly comparable. I highly recommend you read this PC World article that shuts down that comparison and why.
  • Do you have a link to that article? Thanks!
  • Any differences on the fan noise between the two when their temperature is at its peak? Edit: Sorry, read that part now.
  • Great piece of work. I truly enjoy reading this!
  • I'm still seriously impressed Intel's HD 640 is faster than Nvidia's 940M. I thinking like, what's the purpose of a 940 MX in a Surface Book, lol. Btw, why did you guys use PCMark 8 and not 10? :D
  • Will be switching to 10 soon, it's still very new, making sure it's consistent, etc. Re: GPU remember that 940 has more dedicated memory that is also faster than Intel. So, for short bursts it's good, but for longer more memory intensive things like gaming, the 940 will do better. Iris Plus 640 is also very new. When many of those 940's hit in new Ultrabooks this year the Iris Plus was just not available for the i7 config.
  • HD 540 an 640 (Plus or not) are the same thing, except for the ability to decode VP9 on Youtube and run 4K Netflix on Edge AFAIK.
  • Talking about NVIDIA 940M not HD 540.
  • More interesting would be a test where both CPU and GPU are extensively used, like running a game.  My assumption in this case we would see more significant differences between i5 and i7 (assuming i7  runs the game at higher frame rate). But alas, Windows Central "forgot" to test such a scenario.
  • There's always one more test that someone wants to be done. Whatever game I would have chosen you would have just said I used the wrong game and should have used another. I'll be doing another article on gaming anyway, so you'll just have to leave with my hard work here. But let's be honest, who the hell is buying a Surface as a gaming machine anyway. Those people are just wrong. Finally, why the quotes around forgot? That makes no sense. You're not quoting anyone.
  • I don't buy a surface or any ultrabook for gaming, but it's still nice to know what it's capable of. I play a few games on my Surface Pro 3, especially when I'm away from home. I just know most games require my desktop.
  • The issue is more, that tests are used, which do not stress the system. It is not surprising under this test conditions, that you find barely a difference in runtime. A game is just an example for a test, which has no artificial limits on how fast CPU and GPU can go. In this case the i7 would really do more work compared to the iso-work tests you are doing. Agreeing on the quotes, they make no sense.
  • Surprised a little by the SSD speed. It's too bad MS wasn't able to source out some faster modules.
  • The standard warranty should be minimum three years since the ssd is not upgradeable...
  • Great article.  I don't see a lot of these battery / heat comparisons, so thanks for testing and sharing!
  • I like the graphic benchmarks, but also the lack of direct "gaming" evaluation. For some reason, gaming is solely equated to high FPS first person shooter games, which are the most graphically intensive in any generation. My Atom powered Surface 3 can handle quite a few games outside the FPS genera and I'm sure for many genera the Iris graphics would be great.
  • Agreed. I can play Sim City 4 on a Surface Pro 3 just fine.
  • Could you please list these games you are referring to that run well on your Surface 3? Always good to know of good games for lower powered PC tablets.
  • Disciples III: Reincarnation
    Civilization IV
    Civilization Beyond Earth
    Titan's Quest AE
    AoE III Complete Collection
    Starbound
    Stardew Valley
    Banner Saga 1/2
    Neverwinter Nights Diamond
    All the old Black Isle Remasters
    Sid Meier Starships
    The old Impression Games City Builders
    CivCity:Rome
    Invisible Inc.
    Shadowrun Returns series
    Legend of Grimlock Series
    to name a few.
  • Oh yeah, Torchlight and Fate also work really well.
  • Galactic Civ II, III is still too full of expansion updates for me to care about yet.
  • Thanks! As many of these are also iPad games, I wish they had Windows Store versions (and not just Steam). Do you happen to know if Halo Wars (remake of the original on Windows Store) runs well in Surface, and does it support touch?
  • Why is the performance in Geekbench with the new Ipad Pro with an arm processor better than with the i7. Is the new Ipad such a fast device?
  • Because people are not making the right comparisons. It's Apples vs. Oranges despite "geekbench" being the same word.
  • Is this the same for the Surface Pro?
  • Nevermind.i see that question was asked.
  • So are you still favoriting the Surface Pro as a main driver over the Laptop Daniel?  Final verdict?
  • I wrestle with this every day. Super hard to choose. May do an article about it and why it's hard to choose i.e. the pros/cons of each.
  • Hey Daniel!! Great review!! Thank you very much, because I'm really in a huge doubt in which version to buy: i5 8gb 256ssd or i7 8gb 256ssd. Do you think the i5 8gb 256ssd can handle well light programming tasks (java, c, matlab..), and non-professional use of photoshop/illustrator? Or would I really need an i7 for all that? I don't want to expend extra $300 in the i7 version unless it's totally necessary. And besides that, I liked the cobalt blue one. Thanks.
  • Thanks. Yeah, I think Core i5 should be enough. Obviously, an i7 will feel better for some things, but the i5 is more than capable. Adobe Elements runs very well on just about everything.
  • Thanks for your help!
  • Thanks for the very informative article! Daniel, do you think the higher end models with 16 GB and 512 SSD see a drop in battery life due to increased ram and storage?
  • Always tough to quantify that, I've heard years ago that such things affect battery life, but I'm not really convinced now that it does.
  • I think it would be very unnoticeably. There are many variables which will render any test very difficult.
  • Thanks Daniel!  I'm also curious about performance with the 16GB model. My thought is to buy for the long haul and get a fully loaded model as I am not sure about resale value in the future.  
  • SSD should be faster due to parallel nature of NAND chips, not a ton better, but it should be quantifiable. And yeah, 16GB version is the ultimatel, should fair better in the long run.
  • The SSD performance is unfortunate for a premium device like this. I know most people won't notice it, but still. Also, I hope the screen quality is better with the Laptop than the Surface Pro. I returned the two Surface Pros I ordered because of significant light bleed (which I don't have on my SP3). And they pulled out a third Pro in the store and it had identical bleed to the other two. So it seems the initial batch of machines seem to have a bad batch of screens. Daniel I know you said your i7 had no bleed at all, so they must have handpicked machines to go out to the media.
  • I dunno, maybe. Surface Laptop (i7) and Pro (i5) we bought ourselves from the store and seem OK. There was some reddit thread about later batches (batch numbers 1720+) being better for light bleed.
  • The i7 Surface Laptop I tested came with a PM971 that did 1658 MB/s / 911 MB/s
  • I was curious to check how the normal Surface Book with core i5 and Nvidia Geforce GPU (940MX equivalent) would perform in comparison to the PCs used in this article.
    Is there any chance?
  • Don't have a an i5 version around, but can do an i7 version like that.
  • Hi Daniel, many thanks for your reply! Meanwhile I've decided to buy the SB, not with performance base.
    It's the i5, 8GB, 256GB, dGPU (940MX).
    I'm replacing a 2015 HP Spectre x360. After watching many reviews I had to choose a better machine which would be more functional and would suits my needs for my job (photographer and videomaking).
    Would be useful if I'd make some benchmark to compare them with the data you gathered in your benchmarks?
    It could be added in the article to help users to understand any further differences.
    Of course I can't decide by myself if it could be added to the article.
    Thanks in advance.
  • Great read! Can I have the link to the wallpaper? Looks fanatastic!