The Samsung Galaxy S8 features the Qualcomm MSM8998 Snapdragon 835 processor in the US and the Exynos 8895 Octa for EMEA. These are high-end processor that suppose to feature in many high-end Android phones in 2017. The S8 SoC still showing inferior single-processor performance compared to some of the latest iPhones like the iPhone 7 Plus and iPhone 6s. This is quite strange isn't it, because this brand new processor can't beat a 2015 iPhone 6s processor in single-processor benchmark tests.
Some people like Jeff Atwood, the co-founger of stackoverflow.com laughed at that in one of his tweets.
That being said, the Snapdragon 830 is still an extremely fast. This is the same processor found on the Sony Xperia XZ Premium, Sony's latest flagship Android smartphone. The Galaxy S8 did incredibly well in many benchmark tests: 183277 in Antutu v6.2.7 183277, 2065 on Geekbench v4.0 and 39332 in 3DMark Ice Storm Unlimited. It was able to win by a small margin against the iPhone 7 Plus in Geekbench multi-core test by a small margin, but lost by quite a large margin in the single-core test. It still outperforms the Google Pixel and OnePlus 3T (SD 821) in Antutu benchmark tests, not by a lot though (192K, 142K Pixel, 155K OP3T) - (source: cnet).
Many people will definitely compare its performance versus the iPhone 7s, which is its direct competitor at the moment on Apple's side. Having said that, when it comes to Android devices, this is the most powerful processor out there. Both the Snapdragon 835 and Samsung's Exynos 8895 are built using the cutting-edge 10nm process and they are very power efficient. This means that the Galaxy S8 SoC consumes up to 40% less power while offering up to 27% high performance in the Exynos processor. With the Snapdragon we are talking about 25% less power and 25% faster graphics rendering compared to SD821.
Even previous generation processors are still strong enough to hold well through 2017. This is why we've seen LG choosing to stay with the Snapdragon 821 MSM8996 Pro instead of going with the brand new SD835 one. There are not many cases win which you are actually going to see a real difference between the two processors. There where many comparison article written about Snapdragon 835 vs Snapdragon 821 and how these two differ. What we know is that the SD835 has 25 percent faster graphics performance, it provides with more display colors, it promote better battery life, supports Quick Charge 4.0, offers 14-bit dual Spectra image signal processing, offers Bluetooth 5 (faster data transfer with higher data transmit range), has X16 gigabit LTE modem that supports faster download and upload speeds, supports muti-gigabit Wi-Fi, has faster clock speed cores and was built using th 10nm FinFET compared to 14nm on the SD 821.
So the benefit rises above the sheer performance and power saving. It's definitely a very powerful processor which will run everything you throw at it, and you can play the latest high-demanding 3D games with excellent frame rates and without any lags. When you buy the Galaxy S8 you can rest assured that you get a top-performing smartphone. For most users it really doesn't matter so much how it directly compared to the Apple's A10 processor. What matters that it's future-safe and has the performance needed to support the latest and future power-hungry apps and games. Not all apps take use of the multi-core performance advantage, but those who do, such as many 3D games, can certainly benefit for that.
So bottom line, when you buy the Samsung Galaxy S8, you can a top-of-the-line processor and you should expect no less when paying a premium price for this device. For me, the performance alone wouldn't justify an upgrade from the Galaxy S7, yet, I am here to talk about the performance benefits as a whole for those who plan to buy this phone. If you already have the Galaxy S7, you probably want to check out the other advantages that the S8 brings with it and do your own math and decide whether it is worth upgrading to the S8 from the S7.