S7 Edge Throttling & Thermals: Stress-tests Comparing SD820, 810, 808 & Exynos 7420

Now that the Galaxy S7 and S7 Edge have arrived to consumer hands, we can finally begin exploring the nature of the Snapdragon 820 thanks to our first set of tests.

While no amount of single-device testing will reveal the true nature of the 820, we can, at the very least, see how the 820 behaves inside the S7 and S7 Edge, and thus draw conclusions for the resulting performance of this particular package. Because we are testing the Snapdragon 820 confined in the S7 Edge and its waterproof body, and altered by TouchWiz and Samsung configurations, do not extrapolate our results: these scores and temperatures do not reveal how the 820 will behave in every flagship from now on, as many confounding factors will be different.

Our sample consists of 5 devices with various processors: an iPhone 6S+ (Apple A9), S7 Edge (Snapdragon 820), Note5 (Exynos 7420), Moto X Pure (Snapdragon 808) and Nexus 6P (Snapdragon 810), and the HTC One M9 (Snapdragon 810) except for thermal imaging. We found some interesting results that we’d like to share in preparation for our in-depth testing and subsequent S7 Edge review. Without further ado, let’s begin.

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CPU

Geekbench	1		2		3		4		5		6		7		8
Device	Single Core	Multi Core	Single Core	Multi Core	Single Core	Multi Core	Single Core	Multi Core	Single Core	Multi Core	Single Core	Multi Core	Single Core	Multi Core	Single Core	Multi Core
iPhone 6S+	2520	4410	2527	4415	2526	4414	2529	4402	2525	4407	2529	4414	2528	4412	2512	4401
Galaxy S7 Edge	2337	5309	2307	5179	2341	5341	2336	5335	2338	5379	2341	5362	2327	5359	2312	5281
Note5	1476	5127	1480	5148	1476	5141	1474	5147	1480	5018	1472	5115	1472	5071	1475	4984
Moto X Pure	1245	3440	1247	3526	1253	3511	1251	3502	1217	3445	1213	3388	1249	3481	1218	3371
Nexus 6P	1249	4348	1242	4613	1255	4591	1186	4503	1149	4219	959	3647	1018	3908	1001	3801
HTC M9	1307	3911	1284	3943	1243	3885	1217	3832	1186	3826	1163	3860	1147	3660	1068	3563

Here we have the first set of results, after we ran 8 consecutive Geekbench tests. This is a CPU-intensive test that is also cross-platform, allowing us to compare Android and iOS scores.

For those not familiar with the score breakdown, single core scores measure the performance of individual cores while multi core scores measure the performance of multiple cores at once. This distinction is important, because the Snapdragon 820 packs fewer (4) but more powerful cores than the Snapdragon 810 (8) and 808 (6), as reflected in single core scores.

In these tests, the Snapdragon 820 in the S7 fared surprisingly well with virtually no signs of throttling, with the Nexus 6P and HTC One M9 seeing the highest declines consecutively and in the final scores. The Note5 proved remarkably efficient throughout, mirroring the results we obtained on our Note5 in-depth review last year. The Exynos 7420 proved its might once more, and luckily enough, the Snapdragon 820 in the S7 manages to not only score higher than all other devices, but also retain those scores and lead all the way to the end. Below you can see an image comparison that exemplifies the thermal performance seen after the CPU stress-test.

iPhone 6S+, S7 Edge, Note5, Moto X Pure, Nexus 6P

This image is telling as it shows the relative heat efficiency of each phone, with the ranking coming just as we expected and in-line with the final results of both of our tests. The iPhone 6S+ (1st from the left) and Note5 (3rd from the left) show very good thermal efficiency (83°F). As we had noted in our Note5 review, the device rarely got hot, even under stress. The Nexus 6P got the hottest at 95°F, followed by the Moto X Pure at 88°F, and then the S7 Edge. It’s worth noting that the S7 Edge managed to keep a good balance between performance and heat, reaching 84°F, whereas the X Pure and Nexus 6P show less-stable performance. Overall, the S7 Edge kept its cool similarly to the Note5 in this CPU test.

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3D Mark	Initial T (F)	1	2	3	4	5	Final T (F)
iPhone 6S+	90	2759	2561	2469	1900	2076	104
Galaxy S7 Edge	90	2511	2519	2480	2103	2090	99
Note5	90	1258	1246	1244	1199	1232	97
Moto X Pure	91	1023	973	995	1001	968	91
Nexus 6P	95	1330	1180	1283	1185	1141	97
HTC M9	93	1401	1266	1338	1144	1082	97

The newest Adreno processor in the Snapdragon 820 promises up to 40% better performance, and considering how powerful mobile GPUs have been getting, this is nothing to scoff at. We ran our sample through 3DMark and found that the 820 did bring the S7 Edge a sizable increase over both the Nexus 6P and the Galaxy Note5. But unlike our CPU results, the S7 Edge couldn’t keep its lead over subsequent tests. It’s worth noting that we let the device cool down for 30 minutes in a 76°F room, but the initial temperatures were still not perfectly equal, likely due to the final temperature of the previous tests and the materials of the phones.

The Snapdragon 820 S7 Edge began and ended with a good lead over all other Android devices, showing a healthy increase in GPU performance as promised. But the S7 Edge also saw some of the sharpest performance drops in this test, which is admittedly much more intensive than Geekbench. The Nexus 6P fared better by comparison, and the Note5 managed to sustain its performance as well. The M9, however, saw a really sharp decline from 1401 to 1082. At the end of each test we measured temperature again:

Surprisingly, the iPhone 6S+ got the hottest under these tests, with the S7 Edge coming second. Both began the tests at the same temperature as the Note5, which didn’t get quite as hot, but managed to retain its score throughout the 5 rounds. The Nexus 6P surprised us by only getting 2°F hotter than its initial temperature, which we don’t have a clear explanation for; this might be the case that because this is a GPU-intensive test, and it was the CPU and not the Adreno 430 that suffered from architectural issues, thermal management and throttling were less of an issue.

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Closing Thougths

We reiterate: this is by no means representative of the 820 itself, as there are several confounding factors at play including but not limited to proprietary/software modifications, background services, internal hardware allocation, device volume, and more. This is also by no means an exhaustive analysis, but only the beginning of our in-depth testing. However, so far we can spot some interesting behavior displayed by the S7 Edge.

First of all, the Snapdragon 820 does bring noticeable increases in theoretical performance, and this is a very welcome upgrade from what we saw in 2015. Indeed, we find that Qualcomm has managed to tame CPU throttling to a considerable degree. Further tests might reveal different results; if that’s the case, we’ll report back. GPU scores have also improved significantly, but it’s disappointing to see that the S7 Edge is not able to sustain its graphics performance through prolonged stress. That being said, the implications here are not too significant, and so far we haven’t had issues with Gear VR software/performance.

Perhaps what’s most interesting, yet not shocking, is that we still managed to find lag across the user interface, including random stutters and framedrops. Indeed, our go-to GPU profiling test showed many skipped frames when scrolling through the Play Store, significantly more than our 810 devices running stock or close-to-stock software (Nexus 6P, OnePlus 2). We’ve also encountered random input lockups where performance did not take a hit but we simply couldn’t interact with the UI for a few seconds (repeated instances on the camera app and settings menu, reported by two XDA editors).

We haven’t had our hands on this device for very long, and upcoming findings might reveal more about the nature of the S7 Edge, and in turn, further glimpses of the Snapdragon 820’s behavior under varied circumstances. For more coverage on the S7 and S7 Edge, stay tuned as our in-depth review will come soon™.

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