System Performance

Now that we have a better understanding of how the Galaxy S8’s two SoC options perform, it’s time to see how well the S8’s hardware and software work together. To evaluate overall system performance, we turn to the PCMark Work 2.0 suite, which tests the combined effects of the CPU, GPU, RAM, and NAND storage. Because it uses standard Android API calls and runs several different real-world workloads that elicit realistic behavior from the CPU governor (unlike synthetic tests that simply run one or more CPUs at max frequency), it’s a good indicator of everyday performance.

PCMark - Work 2.0 Performance Overall

PCMark - Web Browsing 2.0

PCMark - Writing 2.0

PCMark - Data Manipulation 2.0

Right away we see a very noticeable difference in overall performance between the two different S8 versions. The S8 with Snapdragon 835 tops the chart, scoring better than the previous champion, the Huawei Mate 9, and outpacing the Exynos 8895 version by 29%. Not only is the E8895 S8 slower than its brother, it also fares no better overall than the older Galaxy S7 (S820). Both S8’s are faster than the Galaxy S6, however, with the S835 version scoring 48% better overall and the E8895 version squeaking past with a 15% margin. Compared to the Galaxy S5 and its S801 SoC, the S8 is 100% and 55% faster, respectively.

In the Web Browsing test, the hierarchy at the top half of the chart is largely the same, although the performance deltas are less than what we saw for the overall PCMark scores. The S835 S8 claims the top spot once again and outperforms its E8895 counterpart by 19%. The Galaxy S8 (S835) and Galaxy S5 bracket the results, with the former showing a 66% advantage. The Exynos S8 is a little slower than the Snapdragon version (19%), but is at least faster than all the previous Galaxy phones by as much as 40% relative to the S5. LG phones typically do not perform as well in this test because threads spend more time running on the lower-performing A53 or efficiency CPU cores compared to other phones, presumably a deliberate decision by LG to reduce power consumption.

The Galaxy S8 (S835) delivers the best performance in the Writing test, whose workload elicits frequent, short bursts of activity from the big CPU cores. Our previous testing showed little difference in integer IPC between the S8’s two SoCs, but the S835 model performs 49% better than the S8 with E8895. The primary difference between the two models is how the scheduler migrates threads between the small and big CPU clusters. With the E8895, Samsung is a bit more conservative with moving threads onto the M2 cores. Both S8s are faster than the LG G6 and all the phones using a Snapdragon 820 SoC, though. The S8 is also between 2x and 3x faster than the Galaxy S5.

PCMark - Video Editing 2.0

PCMark - Photo Editing 2.0

The Video Editing test’s workload is not very strenuous, so we do not see much performance variation; however, the Photo Editing test, which applies a number of different photo effects and filters using both the CPU and GPU, shows more interesting results. Qualcomm’s Adreno GPUs stand out here by combining strong ALU performance with driver optimizations. The Galaxy S8 (S835) sits among the phones using S820/S821 at the top of our chart, all sitting above the Mate 9, which is the first phone in this group to use an ARM Mali GPU. Compared to the E8895 model, the S8 (S835) performs 56% better. Curiously, the S8 (E8895) and its 20-core Mali-G71 GPU is considerably slower than the Mate 9’s 8-core Mali-G71 when running this workload.

AndroBench 5.0 - Sequential Read

AndroBench 5.0 - Sequential Write

AndroBench 5.0 - Random Read

AndroBench 5.0 - Random Write
* Note: The OnePlus 3T and Huawei P10 may be using an unpatched version of the F2FS filesystem that artificially inflates write performance.

It’s common to source NAND from multiple vendors, a practice forced into the spotlight this year with NAND chips in short supply. Earlier this year, Huawei took some heat after customers began complaining of poor storage performance in its top-tier Mate 9 and P10 phones. Huawei admitted that it was using lower-performing components due to supply shortfalls, with some customers claiming they received eMMC NAND instead of UFS.

Unfortunately, even Samsung, which is one of the major NAND suppliers, is not immune to this dilemma, sourcing NAND from at least two suppliers for the Galaxy S8. Our E8895 S8 uses Samsung UFS 2.1 NAND and performs about 2x faster in the sequential read and write tests than our S835 S8 that uses UFS 2.0 NAND from Toshiba. The S8’s (S835) write performance, both sequential and random, is particularly poor. This is not necessarily a deal breaker, however, because read performance has a greater impact on user experience.

Storage Performance (AndroBench 5.0)
  Seq. Read
Seq. Write
Random Read
Random Write
  1024 2048 1024 2048 8 16 8 16
Galaxy S8 (S835) 320.91 388.53 66.55 90.41 21.26 37.29 5.53 6.90
Galaxy S8 (E8895) 583.66 674.02 101.31 136.19 32.16 64.59 7.00 12.62
Galaxy S7 (S820) 275.80 324.24 90.52 115.43 19.76 39.65 5.76 10.56
Huawei P10 499.35 541.97 185.50 185.18 55.73 96.00 84.86 139.32
LG G6 314.68 346.02 102.62 112.12 19.24 37.37 5.87 10.84

* Note: The Huawei P10 write values are crossed out because they likely are not accurate.

The table above shows how storage performance scales with larger IO sizes. While the values we use in our general tests above represent the most common IO sizes, other workloads, notably accessing media files like photos and video, will utilize larger IO transfers, so it’s important to see how a phone performs over a wider range of scenarios. 

Throughput generally increases with IO size, and this is certainly true for the S8 (E8895), whose sequential read speed reaches 674 MB/s for 2 MB transfers, surpassing even the speedy P10. Performance for the S8 (S835) scales too, but its write performance remains consistently lower than other flagships; however, at larger IO sizes its throughput surpasses the Galaxy S7 (S820) when reading from storage.

Kraken 1.1 (Chrome/Safari/IE)

WebXPRT 2015 (Chrome/Safari/IE)

JetStream 1.1 (Chrome/Safari)

In the JavaScript tests, both the E8895 and S835 versions of the Galaxy S8 perform similarly, with their scores differing by no more than 8%. This is not surprising considering how close the M2 and Kryo 280 CPUs are in peak frequency and integer IPC. Both S8’s perform well relative to other flagship phones (all of which had the latest updates applied and were running Chrome 57), but do not distinguish themselves as the fastest currently available.

At the other end of the scale, the Galaxy S5 manages to outperform the Moto Z Play Droid (S625) and its octa-core A53 CPU configuration. The S8 offers a much faster browsing experience, of course, not just for JavaScript but also page rendering and scrolling, outperforming the S5 by an average of 2.1x in these three tests.

The Galaxy S8 performs well overall, but isn't consistently leading the pack and thus unable to cleanly establish itself as the premiere flagship in terms of everyday performance. The S835 model, despite its poor write performance, is clearly the faster of the two models when using real-world apps. I did not have much of an opportunity to use the E8895 S8 since it was a time-limited loaner, but the user interface of the S835 model remains quite fluid while swiping and scrolling through the home screen, app drawer, recent apps menu, Edge panel, and browser. The S8 (S835) is the fastest and most fluid feeling Galaxy phone I’ve ever used.

CPU & Memory Performance GPU & Gaming Performance
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  • philehidiot - Friday, July 28, 2017 - link

    A subjective comparison of the two would be good if you can manage it although I appreciate Anandtech is struggling for smartphone reviewers and getting the two models for long enough could be an issue. From my POV my S8 E8895 is pretty slick but you notice the bloatware and it really isn't as smooth as it ought to be. I feel a lot of it is down to poor optimisation of the bloatware which is forced upon you. What I do rather like is the dialer (whilst slow) does look up the number and alert you to "suspected spam" so you can choose to answer the phone as the Savoy Grill or, my personal favourite, the interrogation chamber at Guantanamo Bay.

    Disabling Bixby on this thing is a must as it's just annoying, intrusive and slows everything down. As well as being useless. I took a picture of a chocolate bar, used "Bixby Vision" to try and search for similar things (dunno why you'd want to do this) and it showed me a bag of chocolate dicks. Erm... okay.... thanks, Samsung.
  • coder111 - Friday, July 28, 2017 - link

    What about AOSP or LineageOS support? I know most people don't care, but I do. Is it more likely that Exynos S8 will get decent support, or Snapdragon one? Because that's the major selling point for me. Until there's LineageOS for Samsung S8, I'll prefer OnePlus5.
  • Notmyusualid - Sunday, July 30, 2017 - link

    No LineageOS just yet, I've just checked. Loaded Batman ROM instead, seems OK. I changed the ROM, as the phone kept updating, re-enabling bloatware, and making the 'buttons' default to disappear each time, for each app. Also, to my annoyance, I could not uninstall Facebook.

    But the biggest thing I've not seen mentioned is the fact that the E8895 is a dual-sim phone, which the Snapdragon is not.

    My S8 Plus, I noted, was 3rd fastest on the planet in Antutu benchmarks, and cost 31,050 THB, from the Samsung store. Now that the ROM is changed, I'm happy.
  • jrapoport - Friday, July 28, 2017 - link

    so, you say "lets see how hardware and software work together"... yet you don't try the "samsung app" on a "samsung phone"... I wonder how the chrome-based benchmarks would come out on the samsung browser instead of using chrome?

    I know that would make it harder to actually compare apples-to-apples (ha!), but since benchmarks are really already borderline useless, might at least try to make a fairer useless comparison, right?

    safari on iPhone, vs chrome on pixel vs samsung browser on samsung phone... I'm guessing they might have some further optimizations going on there?
  • Infy2 - Friday, July 28, 2017 - link

    AT apparently no longer provides full featured phone reviews. At this time of the year we have previously seen reviews of Samsung, LG and HTC flagships.
  • jospoortvliet - Friday, July 28, 2017 - link

    I prefer these unique in-dept dives in hardware over generic reviews you can find on any other site... Great read, as always, though I'd love to see even more about he power usage.

    Also, when the SOC's are so closely matched by low level benches but the PCMark test shows such a huge difference (note only that one, not the browser benchmarks or games) it might be worthwhile to consider the PCMark test might not be entirely objective. Any other way to manually test some of its scenario's like writing etc to verify it isn't (accidentally, I'm sure) slanted towards the Snapdragon?

    Of course it is a reality that there's probably more software optimized for the ubiquitous snapdragon than for the SAMSUNG SOC but with a difference THIS big I think it is warranted to look a bit deeper, ask the vendor perhaps if they have a clue at what might be wrong etcetera.
  • Lau_Tech - Friday, July 28, 2017 - link

    Let's see if this new approach endures with the new iphone
  • Badelhas - Friday, July 28, 2017 - link

    The only thing missing is the HTC U11 to that comparison
  • BrokenCrayons - Friday, July 28, 2017 - link

    6.2 inches of screen! That's huge. My first Android tablet had a 7 inch screen. Yeah, there's a lot less bezel around it, but there's a point where a phone becomes too impractical to carry and use and I feel in the name of specs and selling points, we've long since passed that with flagship devices. I'd love to see flagship specs in maybe a 4 to 4.5 inch device. I have nowhere to carry something that big. I guess if it was my only computing device maybe there'd be an excuse for it, but wireless docking and charging would be a must and I'd still prefer a mix of a laptop for big computing tasks and a small phone for computing/communications while on the road.
  • goatfajitas - Friday, July 28, 2017 - link

    I hear you, but it isnt that big. It's very close to the iPhone 6+ and 7+ in size even though they have a 5.5 inch screen... That and the 5.8 inch model is even smaller, closer to 5.2 inch models from the past 3-4 years. Anyhow, there are options, but what suits you.

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