CPU Performance

Microsoft offers the smaller 13.5-inch model with a Core i5-7300U on the base model, but once you add a GPU you get the Core i7-8650U. The 15-inch model comes exclusively with the Core i7 model. This is Kaby Lake Refresh, and the refresh is that Intel doubled the physical number of cores in the CPU, going from two to four. The Core i7 models keep Hyperthreading as well, meaning you get eight threads available. Prior to this fall, the only way to get this many cores was to go with the HQ series of processors, which have a 45-Watt TDP. That would be a bit much for a laptop with a detachable tablet, so the 15-Watt Core i7-8650U is a great way to add more multithreaded performance without increasing the heat output.

Microsoft has also included the same power management software as the Surface Pro, meaning you can choose your power setting as Best Performance, Better Performance, or Best Battery Life, with the latter being the system default. This adjusts the CPU efficiency by tweaking the PL1 and PL2 levels to lower and higher results, depending on the slider setting. When in the default state, the advantage is that the system fans almost never need to be used, meaning the system is nice and quiet, but if you’re doing something that’s processor intensive, turning it up will improve the performance, with the trade-off being noise. As you’d expect, the benchmarks were run in the Best Performance mode, and battery life testing was done in Best Battery Life.

Unlike the Surface Pro, there’s no Iris GPU available, although that’s not a surprise thanks to the much more powerful GPU available in the base, and the fact that Iris isn’t offered yet in the 8th generation products.

To test CPU performance, the Surface Book 2 was run through our standard suite of laptop tests, and compared to several similar models. If you want to compare the Surface Book 2 against any device we’ve tested, please see our Notebook Bench.


PCMark 8 - Home

PCMark 8 - Creative

PCMark 8 - Work

PCMark tests an entire system, from the CPU to the GPU to the storage, and all aspects of the device, including things like the display resolution, impact the results. The Surface Book 2 performs well on all of the tests, and it’s unsurprising to see it at the top for Creative, which has several GPU focused tests.


Cinebench R15 - Single-Threaded Benchmark

Cinebench R15 - Multi-Threaded Benchmark

Cinebench is a rendering test which can use OpenCL, a single CPU thread, or all CPU threads to render the image. Our test focuses on the two CPU tests, and it gives us a great look at per-thread performance, and how that scales with more cores. Here the high turbo frequency of the Core i7-8650U delivers excellent single-threaded performance, and the multi-core result is also very strong. It can’t quite hang with XPS 15, but that has a 45-Watt TDP on its eight threads, allowing them to maintain a much higher turbo for the multithreaded result.


x264 HD 5.x

x264 HD 5.x

Much like Cinebench, the x264 test converts a video using the CPU, and more cores with higher frequency generally wins the day here. The Surface Book 2 outperforms all other laptops with the 15-Watt TDP U series CPU in this test, but the higher TDP XPS 15 can still outperform it significantly when all cores are utilized.

Web Tests

The web is one of the most-used tools around, but performance on the web can be tied to the CPU as well as the browser itself. Over time, scripting performance in the browser continues to improve, and which browser you use will also impact performance and battery life. To make everything consistent, we utilize Microsoft Edge for all testing on Windows.

Mozilla Kraken 1.1

Google Octane 2.0

WebXPRT 2015

The Surface Book 2 has a slight CPU advantage over the ASUS ZenBook 3, and with that edge it creeps ahead in all of the web tests. The extra cores, as well as the updates to the browser with the Fall Creators Update, have made a significant difference over the older results. It would be nice to go back on some of these older devices to see how much of an impact the browser updates have made, if we still had the devices.

CPU Conclusion

As we saw with the ASUS ZenBook 3, the move to quad-core in the U series of Core chips has been very welcome. The performance increase is impressive over the older dual-core models, and although the eight threads run into the thermal limit quicker than the do on the higher-wattage HQ series chips, such as seen in the Dell XPS 15, the Core i7-8650U is still a very strong performer.

Storage Performance

The review unit for the Surface Book 2 shipped with the maximum drive size available, which is the 1 TB model. Thanks to the parallel nature of SSDs, this model should offer the best performance. The drive in the unit is a Samsumg PM961, which is a TLC based drive.

Performance is excellent for a TLC drive, and we do see the sequential write being affected by the TLC NAND, but all other aspects of the performance are excellent. In a device hitting this price target, a MLC version of this drive would be preferable, but it’s unlikely most people will notice the limits of this drive because it is quite good.

Design GPU Performance
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  • gentryfunk22 - Sunday, December 31, 2017 - link

    My partner just received this device as her main laptop at work. The Surface 2 replaced a MacBook Air. Her main complaint is the trackpad. It is terrible. Does not track well, the hotspots work inconsistently, and clicks are not recognized. Use as a tablet drains the battery much faster than is found in this article...in fact, during a conference call last week, she got about 90 minutes of use from full charge in tablet mode. FYI
  • ajay92 - Monday, January 1, 2018 - link

    Seems like it will get too hot too fast
  • YaronGo - Monday, January 15, 2018 - link

    Buyer beware: System stability is a big issue with Gen1. Does Gen2 solve this?

    I bought the first generation the month it came out, and to date it is suffering from instability (not as many daily BSODs thank god - the first year was a nightmare!). WiFi doesn't connect to all networks, sometimes requiring reboot. Sometimes it goes into tablet mode thinking it's in that mode and not letting you use the keyboard/mouse, and that's just two I have issues with daily. Then there's battery drain (3 hours some days) and problems going into hibernation (yeah, it's fun to lose all your work!).

    I'd be very wary of buying an expensive laptop like this. Wait till you get some reviews after 3 months of daily use. Check out Gen1 reviews/forums for reference.
  • damianrobertjones - Thursday, October 11, 2018 - link

    ...and the biggest question is: Why didn't you get it replaced? We have 3 SBooks in work. So far all have been fine.
  • Timur Born - Wednesday, January 24, 2018 - link

    All USB ports are still connected to a subpar Genesys Logic USB hub chipset instead of being directly connected to the Intel chipset. This was a problem with version 1 and remains to be a problem with version 2. It's a slightly improved new chipset, though. Still an unnecessary solution, only meant to lower production cost instead of improving user experience.
  • damianrobertjones - Thursday, October 11, 2018 - link

    ...and the general user experience will be the same as no-one will notice.
  • Chris_outwright - Thursday, April 12, 2018 - link

    Cinebench R15 and with SB2 15" you get over 600 or 700 Points. This is Bull S*. I got between 500-600. Either your device is rigged or you got absolutely the best out of the Silicon Lottery, and I the worst!
  • winndzn02 - Sunday, May 13, 2018 - link

    My surface book 2 15 is only getting 5000-6000 firestrike test results. That is so much lower than what you are getting. Would you have any idea why this would be? Id love some help from anyone here!
  • WindowsXp16 - Tuesday, January 15, 2019 - link

    Brett Howse - Whats your max CPU temp. I recently got the 15" Surface Book 2 and my temps using cinebench reach up to 90 plus degrees Celsius. I am trying to figure out if this is normal so i can decide weather to exchange my unit or not

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