At the recent Qualcomm Snapdragon Tech Summit, the company announced its new flagship smartphone processor, the Snapdragon 8 Gen 1. Replacing the Snapdragon 888, this new chip is set to be in a number of high performance flagship smartphones in 2022. The new chip is Qualcomm’s first to use Arm v9 CPU cores as well as Samsung’s 4nm process node technology. In advance of devices coming in Q1, we attended a benchmarking session using Qualcomm’s reference design, and had a couple of hours to run tests focused on the new performance core, based on Arm’s Cortex-X2 core IP.

The Snapdragon 8 Gen 1

Rather than continue with the 800 naming scheme, Qualcomm is renaming its smartphone processor portfolio to make it easier to understand / market to consumers. The Snapdragon 8 Gen 1 (hereafter referred to as S8g1 or 8g1) will be the headliner for the portfolio, and we expect Qualcomm to announce other processors in the family as we move into 2022. The S8g1 uses the latest range of Arm core IP, along with updated Adreno, Hexagon, and connectivity IP including an integrated X65 modem capable of both mmWave and Sub 6 GHz for a worldwide solution in a single chip.

While Qualcomm hasn’t given any additional insight into the Adreno / graphics part of the hardware, not even giving us a 3-digit identifier, we have been told that it is a new ground up design. Qualcomm has also told us that the new GPU family is designed to look very similar to previous Adreno GPU sfrom a feature/API standpoint, which means that for existing games and other apps, it should allow a smooth transition with better performance.  We had time to run a few traditional gaming tests in this piece.

On the DSP side, Qualcomm’s headlines are that the chip can process 3.2 Gigapixels/sec for the cameras with an 18-bit pipeline, suitable for a single 200MP camera, 64MP burst capture, or 8K HDR video. The encode/decode engines allow for 8K30 or 4K120 10-bit H.265 encode, as well as 720p960 infinite recording. There is no AV1 decode engine in this chip, with Qualcomm’s VPs stating that the timing for their IP block did not synchronize with this chip.

Qualcomm's Alex Katouzian

AI inference performance has also quadrupled - 2x from architecture updates and 2x from software. We have a couple of AI tests in this piece.

As usual with these benchmarking sessions, we’re very interested in what the CPU part of the chip can do. The new S8g1 from Qualcomm features a 1+3+4 configuration, similar to the Snapdragon S888, but using Arm’s newest v9 architecture cores.

  1. The single big core is a Cortex-X2, running at 3.0 GHz with 1 MiB of private L2 cache.
  2. The middle cores are Cortex-A710, running at 2.5 GHz with 512 KiB of private L2 cache.
  3. The four efficiency cores are Cortex-A510, running at 1.8 GHz and an unknown amount of L2 cache. These four cores are arranged in pairs, with L2 cache being private to a pair.
  4. On the top of these cores is an additional 6 MiB of shared L3 cache and 4 MiB of system level cache at the memory controller, which is a 64-bit LPDDR5-3200 interface for 51.2 GB/s theoretical peak bandwidth.

Compared to the Snapdragon S888, the X2 is clocked higher than the X1 by around 5% and has additional architectural improvements on top of that. Qualcomm is claiming +20% performance or +30% power efficiency for the new X2 core over X1, and on that last point it is beyond the +16% power efficiency quoted by Samsung moving from 5nm to 4nm, so there are additional efficiencies Qualcomm is implementing in silicon to get that number. Unfortunately Qualcomm would not go into detail what those are, nor provide details about how the voltage rails are separated, if this is the same as S888 or different – Arm has stated that the X2 core could offer reduced power than the X1, and if the X2 is on its own voltage rail that could provide support for Qualcomm’s claims.

The middle A710 cores are also Arm v9, with an 80 MHz bump over the previous generation likely provided by process node improvements. The smaller A510 efficiency cores are built as two complexes each of two cores, with a shared L2 cache in each complex. This layout is meant to provide better area efficiency, although Qualcomm did not explain how much L2 cache is in each complex – normally they do, but for whatever reason in this generation it wasn’t detailed. We didn’t probe the number in our testing here due to limited time, but no doubt when devices come to market we’ll find out.

On top of the cores is a 6 MiB L3 cache as part of the DSU, and a 4 MiB system cache with the memory controllers. Like last year, the cores do not have direct access to this 4 MiB cache. We’ve seen Qualcomm’s main high-end competitor for next year, MediaTek, showcase that L3+system cache will be 14 MiB, with cores having access to all, so it will be interesting to see how the two compare when we have the MTK chip to test.

Benchmarking Session: How It Works

For our benchmarking session, we were given a ‘Qualcomm Reference Device’ (QRD) – this is what Qualcomm builds to show a representation of how a flagship featuring the processor might look. It looks very similar to modern smartphones, with the goal to mirror something that might come to market in both software and hardware. The software part is important, as the partner devices are likely a couple of months from launch, and so we recognize that not everything is final here. These devices also tend to be thermally similar to a future retail example, and it’s pretty obvious if there was something odd in the thermals as we test.

These benchmark sessions usually involve 20-40 press, each with a device, for 2-4 hours as needed. Qualcomm preloads the device with a number of common benchmarking applications, as well as a data sheet of the results they should expect. Any member of the press that wants to sideload any new applications has to at least ask one of the reps or engineers in the room. In our traditional workflow, we sideload power monitoring tools and SPEC2017, along with our other microarchitecture tests. Qualcomm never has any issue with us using these.

As with previous QRD testing, there are two performance presets on the device – a baseline preset expected to showcase normal operation, and a high performance preset that opportunistically puts threads onto the X2 core even when power and thermals is quite high, giving the best score regardless. The debate in smartphone benchmarking of initial runs vs. sustained performance is a long one that we won’t go into here (most noticeably because 4 hours is too short to do any extensive sustained testing) however the performance mode is meant to enable a ‘first run’ score every time.

Testing the Cortex-X2: A New Android Flagship Core
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  • Fulljack - Wednesday, December 15, 2021 - link

    resale value is cool and all but not everyone bought a phone to be sold later down the road. just like how some people simply didn't like iOS and it's limitations.
  • michael2k - Thursday, December 16, 2021 - link

    Some people use the extended life of an iPhone for other things; that’s part of why they have high resale value.

    In other words people hand down three year old iPhones to kids or spouses. Some people want to keep their iPhones. Those people, as an example, refusing to let their iPhones go for sale increase the resale price by reducing supply in the face of demand.
  • iphonebestgamephone - Tuesday, December 14, 2021 - link

    Iphones are pretty bad for gaming for more than a few minutes unless you have very low ambient temps or are willing to use a plugged to the wall phone cooler. Something like the redamgic or legion are better for mobile 'gamers'.
  • hemedans - Wednesday, December 15, 2021 - link

    I disagree, if you play games get android gaming phones, they can sustain perfomance compare to iphones which throttle a lot and mislead in lot of metrics (like operate in 120fps when you are on menu and drop to 60fps when you fight)

    Also with Android you get more games options, like now Ps2 emulator has been released, you wont find something like this in ios, also lot of pc games have been ported to Android, you can enjoy them on go.
  • yankeeDDL - Tuesday, December 14, 2021 - link

    As an Android user, the results in Spec CPU 2017 are depressing.
    In every single test the X2 is far behind A15 (sometimes by nearly 2x) and yet in every single one the A15 uses less power. It is a bloodbath.
    I realize the synthetic tests are not necessarily representative of use case, but it sure looks dismal for Qualcomm. They are extraordinarily behind.
    Imagine if the next Galaxy S22 would use the A15: it would be 2-3 years ahead of all competition.

    The lack of competition in high-end ARM-based CPU is just mind-boggling.
  • Wrs - Tuesday, December 14, 2021 - link

    Yeah it seems very incremental on the CPU. They need a revolution just to catch up. But their GPU and NN seem like bigger leaps. Unfortunately both are more limited use cases - gaming and speech recognition primarily.
  • Kangal - Sunday, December 19, 2021 - link

    With the way Qualcomm has followed with the Wattage, they've only been achieving better and better scores at the expense of battery and heat. Basically they've embraced throttling. And that's not an acceptable solution for phones.

    There's little to no performance difference between the QSD 855 to its siblings*. And that seems to be the case with the new Snapdragon 8gen1 for 2022. The biggest difference I can see is at the highest-end emulation, which is to run the latest console, with the highest graphical title, and scale up resolution as appropriate. Currently, this is the Nintendo Wii, running Metroid 3 Prime, and upscaled to x4 (1440p). On the fastest Android Phones (eg ASUS RoG 5) it runs around 50-60fps depending on the scene. On something like a Samsung S10+ you're instead getting 40-50fps. And the bigger improvement can come from the natural progression of the emulator itself (ie 2018 vs 2021), and by running Mods on it like MMJ. So these things can/do bridge the performance difference that I stated above.

    What might be a good argument to be made, is when we get other more powerful/demanding use cases. Such as comparing Nintendo Switch emulation, running desktop programs, or even getting a new AAA-game that was developed for the handheld (eg GTA 6). Anyways, we will see a separation from current performance tier, at the earliest with 2023 using second-generation ARM Europe microarchitecture. Android hasn't quite caught up to Apple A13 levels of performance yet, and that's what I think when we will surpass it (Apple's A14 and A15 aren't that much better than their A13 either).

    *855+, 860, 778, 780, 865, 865+, 870, 888, 888+.
  • Wereweeb - Tuesday, December 14, 2021 - link

    When I can use it as a desktop replacement I'll start to care. Until then, all you get with a "muh faster CPU" is your apps take three nanoseconds less time to open.

    My next phone will be the GAA-FET (3-2nm) successor to the 780G, for the better energy-efficiency. If it takes five years, so be it. I don't game so I don't have a use for X2 cores.
  • 1_rick - Tuesday, December 14, 2021 - link

    "When I can use it as a desktop replacement I'll start to care."

    DeX, dude. It's already good enough for light work.
  • TheinsanegamerN - Tuesday, December 14, 2021 - link

    Also limited to samsung devices. Perhaps Wereweeb has no interest in owning one of their devices. There are many that have no interest in owning a samsung based on past experiences.

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