In what has become an annual tradition for Qualcomm, the company has once again opened the doors of their San Diego headquarters to the press to take a preview look at the next generation of their flagship mobile platform. These events have been going on for several years now, and have become an integral part of how Qualcomm approaches the public with their wares; preview events not only let them set expectations, but to get the word out to technically-minded audiences in a vendor-neutral manner. Rather than being one part in the next flagship smartphone, preview day means that everything can be about Qualcomm and the platforms that they have created.

Late last year Qualcomm announced the Snapdragon 845 platform, the successor to 2017’s Snapdragon 835. Implementing a number of important architectural improvements over its predecessor, the Snapdragon 845 gets to follow-up on what ended up being a rather well-received platform in the Snapdragon 835, and to see if Qualcomm can maintain their momentum. Qualcomm used their December event to release a good bit of info on the 845 in advance, so we’ve already had a chance to see what Qualcomm is planning architecturally. And now with the preview event we finally get to see how all of this comes together with a look at the platform as a whole.

Whenever discussing the state of affairs of Qualcomm’s flagship SoCs, I always struggle not to tie it to the Snapdragon 810 in some fashion. Which not to beat Qualcomm over the head for past mistakes – in that case a poorly thought out response to Apple – but rather because it serves as a such a great point of reference for discussing the company’s SoC development as a whole. 810 was arguably the company’s low point, so everything since then has been part of a rather remarkable upward trajectory for the flagship Snapdragon. Even though Qualcomm has been leading the pack in high performance SoCs for several years now, last year’s Snapdragon 835 in particular really felt like Qualcomm was in that position for all-around technical capabilities and not merely because of size, momentum, and the realities of LTE licensing.

All of this means that there’s a lot riding on the Snapdragon 845, just in a different and less obvious way than before. Qualcomm has redeemed themselves from the 810 and it’s not a question of whether they can put together a great SoC, but instead it’s a question of how they will follow up upon a great SoC like the 835.

Qualcomm Snapdragon 845 vs 835
SoC Snapdragon 845 Snapdragon 835
CPU 4x Kryo 385 Gold (A75 derivative)
@ 2.8GHz 4x256KB L2

4x Kryo 385 Silver (A55 derivative)
@ 1.77GHz 4x128KB L2

2MB L3 in DSU
4x Kryo 280 Gold (A73 derivative)
@ 2.45GHz 2MB L2

4x Kryo 280 Silver (A53 derivative)
@ 1.90GHz 1MB L2
GPU Adreno 630 Adreno 540 @ 670/710MHz
Memory 4x 16-bit CH @ 1866MHz
LPDDR4x
29.9GB/s

3MB system cache
4x 16-bit CH @ 1866MHz
LPDDR4x
29.9GB/s
ISP/Camera Dual 14-bit Spectra 280 ISP
1x 32MP or 2x 16MP
Dual 14-bit Spectra 180 ISP
1x 32MP or 2x 16MP
Encode/
Decode
2160p60 10-bit H.265
720p480
2160p30 (2160p60 decode),
1080p120 H.264 & H.265
Integrated Modem Snapdragon X20 LTE
(Category 18/13)

DL = 1200Mbps
5x20MHz CA, 256-QAM

UL = 150Mbps
2x20MHz CA, 64-QAM
Snapdragon X16 LTE
(Category 16/13)

DL = 1000Mbps
3x20MHz CA, 256-QAM

UL = 150Mbps
2x20MHz CA, 64-QAM
Mfc. Process 10nm LPP 10nm LPE

The answer to that comes in the form of the Snapdragon 845, an interesting SoC that is a “tock” design if there ever was one. Qualcomm doesn’t get the advantage of an entirely new manufacturing node – the 845 is being made on Samsung’s second-generation 10LPP process, a refined version of 10LPE used for the 835 – so Qualcomm’s improvements are rooted almost entirely in architecture rather than a mix of architecture and manufacturing. Which is to say that it’s a bit of an uphill challenge for the company, but the flip side of that argument is that it’s going to be a chance for Qualcomm’s architectural engineers to take attention front and center.

What the Snapdragon 845 entails then, as we originally learned late last year, is a series of upgrades and overhauls across all the various subsystems of the SoC. Arguably the biggest news here is that Qualcomm’s latest-generation Kyro 385-series CPU cores are derived from ARM’s Cortex-A75 and A55 designs, and that the resulting SoC is the first to employ ARM's DynamiQ CPU cluster organization. DynamIQ enables the various different CPU cores within an SoC to be hosted within the same cluster and cache hierarchy, as opposed to having separate discrete clusters with no shared cache between them, allowing for finer-grained and more efficient approaches to when and how various clusters are powered up. Meanwhile on the GPU side, the notoriously tight-lipped GPU group over at Qualcomm has confirmed that the Snapdragon 845 implements the first Adreno 600 series GPU, which in turn is the first new GPU architecture from Qualcomm in a couple of years and promises some significant performance improvements.

Outside of the core processor architecture, the changes in the rest of the SoC are perhaps not quite as dramatic, but still important to the platform as a whole. This includes, of course, Qualcomm’s latest and greatest LTE modem, the Snapdragon X20, upgrading Qualcomm’s LTE capabilities category 18. Both the camera ISP and Hexagon DSP have also been upgraded as well with the introduction of the Spectra 280 and Hexagon 685, which Qualcomm will be leveraging for camera image quality improvements and their stake in the modern mobile AI race respectively. Finally, the SoC also includes the latest version of the company’s Aqstic audio codec, which although audio has not traditionally been heavily promoted by the company, will be an increasingly important part of differentiating itself from other high-performance mobile SoCs.

Getting down to the heart of matters then, this year’s flagship Snapdragon platform preview is a lot like last year’s. We’re once again taking a look at a Qualcomm Reference Design (QRD), which is a fully functional smartphones in a slightly oversized, utilitarian chassis used for hardware testing and software development. The Snapdragon 835 QRD was a 5.5-inch equivalent phone, and for the 845 QRD Qualcomm has stuck with much the same. The device itself is unremarkable, featuring a 1440p LCD and 6GB of LPDDR4X memory, but it’s otherwise typical of the class of Snapdragon 845 devices we expect to see starting a bit later this year.

Similarly, while this is still a preview, final device performance shouldn’t be too much different from what we see with Qualcomm’s QRD. Vendors do make customizations to both hardware and software, so how a device’s cooling system is built or how aggressive the power management is configured will have an impact on final performance. But as far as stock performance goes, the QRD is about as neural as it gets, if not a slightly idealized case for the platform as it allows Qualcomm to optimally configure the phone themselves.

CPU & Memory Subsystem
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  • Tigran - Monday, February 12, 2018 - link

    Any ideas why S821 overperforms both S845 and S835 in Geekbench 4 Floating Point Performance Single Threaded? Reply
  • Andrei Frumusanu - Monday, February 12, 2018 - link

    The original Kryo had very robust FP execution pipelines while having weaker integer and memory subsystems. Please keep in mind those are normalized per clock, not absolute performance. Reply
  • Tigran - Monday, February 12, 2018 - link

    Does it mean the new Kryo in S835 & S845 compromises FP performance to obtain better performance in integer calculations (per clock)? Reply
  • Andrei Frumusanu - Monday, February 12, 2018 - link

    The new Kryo's have nothing to do with the microarchitecture of the original S820 Kryo as the former are ARM designs while the latter was a full Qualcomm design - you can't say compromise as it's not a deliberate choice but that's just the differences between the CPUs. Reply
  • jjj - Monday, February 12, 2018 - link

    And efficiency is not factored in, Kryo was not great at that. Reply
  • gregounech - Monday, February 12, 2018 - link

    First word of System performance page should be "Now we see how" and not "How we see how" :)

    Otherwise great job Andrei & Ryan!
    Reply
  • tuxRoller - Monday, February 12, 2018 - link

    From fd.o:

    "The a6xx GPU is an iteration of the a5xx family so most of the GPU side code
    looks pretty close to the same except for the usual register differences. The
    big different is in power control. On the a5xx there was a rudimentary device
    called the GMU that did some basic power stuff but left most of the complexity
    to the kernel. On the a6xx the power complexity is being moved to a component
    called the GMU (graphics management unit)."

    https://lists.freedesktop.org/archives/dri-devel/2...
    Reply
  • GC2:CS - Monday, February 12, 2018 - link

    Seems like qualc is at their pre 810 days again. It’s definitely going to be a standrad of android soc this year.
    Regarding the entire mobile landscape, I think Qualcomm dropped the ball with legacy ARM designs, and everyone got somewhat lazy with their own design and IPC. And it looks kind of poor now that Apple is now on their sixth gen of custom, each bringing a significant improvement.

    GPU got more impresion. Obviously they’ve done a lot of work over the years. It is going to be interesting if they can claim the crown from Apple this year for that. On the other hand Apple got a bit lazy with the GPU too - with A9 and A10 being excessively power hungry because they reused the same core clocking it higher.
    It’s super impressive they managed to match A11 at peak, but they should not slow down as that is Apple’s first GPU and the efficiency they pulled over A10 is just insane - this year is gonna be exciting.

    But OEM’s migt want to bring up somewhat more than just make device upgrades rely on some%qeuieckerer moniker.
    Reply
  • generalako - Monday, February 12, 2018 - link

    Andrei Frumusanu has completely lost his legitimacy as a writer on Anandtech. In this post here, he makes the ridiculious claim that Snapdragon 845 should offer "expected performance improvement to 39-52%", despite the fact that Qualcomm themselves very clearly state "up to 25% improvement" on their launch and on their own site: https://www.anandtech.com/show/12114/qualcomm-anno...

    Now, 2 months later, he merely repeats what Qualcomm said all along, based on the results he got from the device: an overall 20-25% performance improvement.
    Reply
  • StormyParis - Monday, February 12, 2018 - link

    On the article you read, Qualcomm's lists performance at iso-process and frequency (34% for Geekbuying, 48% for Octane), to which you then add the performance gain due to the frequency. That makes Andrew's figures cogent, and your comment idiotic. Reply

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