Today as part of its media event, Qualcomm finally announced the much expected Snapdragon 845, successor to last year's very successful Snapdragon 835. The Snapdragon 845 is a large step in terms of SoC architectures as it's the first to employ ARM's DynamiQ CPU cluster organization. Quickly explained, 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 (with coherency instead happening over an interconnect such as ARM's CCI). This major transition is probably the largest to date that we've seen in modern mobile smartphone ARM consumer SoCs. 

Qualcomm Snapdragon Flagship SoCs 2017-2018
SoC Snapdragon 845 Snapdragon 835
CPU 4x Kryo 385 Gold (A75 derivative)
@ 2.8GHz 4x256KB L2

4x Kryo 385 Silver (A55 derivative)
@ 1.80GHz 4x128KB L2

2MB L3
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

3MB system cache
4x 16-bit CH @ 1866MHz
ISP/Camera Dual 14-bit Spectra 280 ISP
1x 32MP or 2x 16MP
Dual 14-bit Spectra 180 ISP
1x 32MP or 2x 16MP
2160p60 10-bit H.265
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 Snapdragon 835's Kryo 280 performance and efficiency cores make use of ARM's Built on ARM Cortex Technology license which allows Qualcomm to make requests to ARM to change some aspects of the architectures of newly released cores and implement these changes exclusively into Snapdragon SoCs. As such the S835's CPU cores were derivatives of ARM's Cortex A73 and Cortex A53 CPU IPs. The Snapdragon 845 being the first SoC to be based on a DynamIQ big.LITTLE CPU organization also undoubtedly suggests that the Kryo 385 CPUs are based on ARM's Cortex A75 and Cortex A55 IPs, as these are the only DynamIQ compatible CPU cores available to date.

The Kryo 385 gold/performance cluster runs at up to 2.8GHz, which is a 14% frequency increase over the 2.45GHz of the Snapdragon 835's CPU core. But we also have to remember that given that the new CPU cores are likely based on A75's we should be expecting IPC gains of up to 22-34% based on use-cases, bringing the overall expected performance improvement to 39-52%. Qualcomm promises a 25-30% increase which is at the low-end of ARM's projections.

The silver/efficiency cluster is running at 1.8GHz, this is clocked slightly slower than the A53's on the Snapdragon 835 however the maximum clocks of the efficiency cluster is mainly determined by where the efficiency curve of the performance cluster intersects. Nevertheless the efficiency cores promise 15% boost in performance compared to its predecessor.

The new Snapdragon 845 now includes capacitors on its package underside

The L3 located on the DynamIQ DSU is configured at 2MB and we're likely seeing 256KB/128KB options for the performance and efficiency core private L2's. Together this would mean there's a total of 3.5MB of combined L2 and L3 cache on the CPU complex.

Qualcomm interestingly disclosed that we're only seeing three voltage and frequency planes implemented; likely meaning a single plane each for the performance cores as well as the efficiency cores as well as a plane for the L3 and DSU. This is surprising as DynamIQ allows finer grained frequency/voltage planes and given Qualcomm being traditionally a big proponent of asymmetric planes such as implemented in Krait I would have expected to see a more non-traditional approach, something that would have been facilitated given the fact that Qualcomm likes to include on-chip LDO regulators for powering the CPU clusters.

Related to the caches but not part of the CPU, there's also a new inclusion of a 3MB system cache. This is likely a SoC interconnect cache and serves all SoC blocks - likely in similar fashion the "L3" cache on Apple A-series SoCs works. This would help reduce external memory transactions and thus also reduce power to the memory controllers and DRAM. Qualcomm claims it's able to reduce memory access bandwidth by up to 40-75%, a significant figure.


The Snapdragon 845 comes with a new generation of the Adreno GPU, called the Adreno 630. The switch from a 5xx family to a 6xx family GPU, as with previous introductions from Qualcomm usually marks the transition consisting of larger architectural changes.

Qualcomm is as usual very tight-lipped about details of its GPU but it promises a performance increase of 30% while also increasing power-efficiency by 30%. What this translates to is basically we're looking at 30% higher frame-rates while maintaining the same power consumption of the Snapdragon 835, which is an excellent improvement.

DSP Upgrade to Hexagon 685

The DSP sees a evolutionary upgrade from the 682 to the 685. Again details about the improvements are relatively sparse but Qualcomm promises improvements in power and performance, especially for AI and imaging tasks. Qualcomm made an emphasis on AI processing during the presentation and claim that the new IP achieves up to 3x increase in performance compared to the Snapdragon 835.

Traditional DSP architectures are usually not well optimized for neural network processing so we'll have to adopt a wait & see approach when it comes to the performance of the new Hexagon 685 when executing such tasks. SoCs which have a dedicated NPU such as the Apple A11 or Kirin 970 still have a large edge here as they augment the image processing pipeline instead of handing such tasks over to the DSP which might have to do double duty of both image processing (such as HDR) and image analysis via neural network processing (image recognition and classification).

Snapdragon X20 Modem Now Integrated

As is traditional with Qualcomm we first see cutting-edge modem implementations first released as independent discrete modems and only afterwards do we see them integrated into the newest high-end SoCs. The Snapdragon 845 now integrated the X20 modem released earlier in the year which we've covered in a dedicated article.

The new modem elevates the LTE UE Category to 18 as it's now capable of 5xCA as opposed to 4xCA on the X16 modem integrated in the Snapdragon 835. This allows for download speeds of up to 1.2Gbps when in a 5x20MHz downstream carrier aggregation mode, that is of course, if you're lucky enough for your mobile carrier to support such configurations.

Improved Media Capabilities

The Snapdragon 845's display pipeline receives an upgrade for VR and claims to be now able to drive dual-2400x2400p120 displays for VR headsets. The video recording capabilities have been improved as the Snapdragon 845 increases maximum video encoding framerate at 4K recording from 30 to 60fps compared to the Snapdragon 835. Qualcomm advertised support for Rec.2020 wide gamut color space recording, meaning we now see full support for HDR10 HEVC recording which should be an interesting addition I'm looking forward to test.

The new Spectra 280 ISP's most standout feature seems to be multi frame noise reduction (MFNR) which is a feature that I believe is also used in Google's HDR+ proprietary processing. The feature captures multiple pictures in fast succession and applies an algorithm to apply noise reduction in higher quality fashion compared to traditional single-frame noise reduction which can introduce blurriness.

Manufactured on Second Generation 10LPP Process

The Snapdragon 845 comes manufactured on a second generation 10LPP process from Samsung. This was a natural evolution to be expected as the Snapdragon 835 was manufactured on 10LPE. Samsung promises performance increase of up to 10% at the same power levels or reduced power consumption of up to 15% at the same performance. Samsung had just announced last week the start of mass production for 10LPP. I was rather surprised to see the larger frequency boost to 2.8GHz on the performance cores as the Snapdragon 835 came with rather conservative frequencies of only 2.45. The A75 promised increased performance at the same efficiency, meaning the core uses more power to reach the higher performance point compared to the A73.

Most devices I've seen with Snapdragon 835's used about 1.1W per core at peak using the power virus-style workload we traditionally use so seeing the Snapdragon 845 using the new processor architecture as well as increases in frequency is quite surprising as both would increase the absolute power consumption of the CPUs. The two possible scenarios we're likely to encounter is that either the Snapdragon 845 CPU complex uses more power or that Samsung has managed to vastly improve its manufacturing process over the last year to allow for such gains.

"Tock" Generation For CPU and GPU

The new Snapdragon 845 brings with itself one of the biggest architectural shifts in the ARM SoC space with the first implementation of the new DynamIQ cluster hierarchy. With an expected solid 30% performance boost on both CPU and GPU we're likely to see a healthy upgrade for 2018 flagship devices. Overall the Snapdragon 845 fulfils most of its expectations and in a time in the Android ecosystem where improvements have slowed down this is a good thing. The Snapdragon 835 was an excellent SoC as it balanced performance and power perfectly and thus re-solidified Qualcomm's positioning as the go-to solution for mobile SoCs. On paper the Snapdragon 845 seems to continue this balance and if all goes as planned we're likely to see another healthy generation of devices in 2018 that we're eagerly awaiting to review.



View All Comments

  • Jts2 - Thursday, December 07, 2017 - link

    Yeah... Look at the die sizes of A11 vs SD835. If Qualcomm had the option to use such a big die size, I am sure it can improve upon a lot of things. Apple fanboys don't realize this. Reply
  • HammerStrike - Thursday, December 07, 2017 - link

    Yep, because if there is one thing performance enthusiasts get worked up about it’s to large of a die size. Obviously Apple is just phoning it in. Reply
  • generalako - Thursday, December 07, 2017 - link

    >"If Qualcomm had the option to use such a big die size, I am sure it can improve upon a lot of things. "

    But they don't. That's the whole point. And there's no legitimate reason for why various chip makers for Android are so far behind Apple. The argument for making an SoC for many OEMs is something maybe Qualcomm can use (although it's also lazyness, as Qualcomm don't actually design their own architecture, they license it from ARM). But what about Samsung and their Exynos chips? Huawei and their Kirin? These companies are making chips that are being used specifically by their own flagship, just like Apple. How come they don't have that advantage?

    >Apple fanboys don't realize this.

    Except I'm not. I hate everything about Apple and can't bear using iOS. But the facts of the matters are clear, and Apple SoC performs way, way better than anything ont he Android platform. The difference is big enough to be embarrasing. Even Intel didn't ever have such an advantage over AMD at any time.
  • jospoortvliet - Friday, December 08, 2017 - link

    I can only say 'amen' to this. I feel the Android companies have become lazy - they don't even try to compete anymore, at least on cpu performance. And as I'll buy an apple the day the sun goes supernova it means I can only get the second best on the market with a huge gap between the number one. Reply
  • mpbello - Saturday, December 09, 2017 - link

    Your comment about AMD vs Intel was absurd. Just before Ryzen was launched, Intel was very very far ahead.

    Regarding Apple vs. Qualcomm, first of all we need to keep in kind that TSMC is the leading foundry today and their advantage over Samsung will only widen in the next 18 months. So based on process manufacturing technology alone Apple has more than 6 months advantage over everyone else. Than we arrive at Android ecosystem. Who in their right mind would develop any app in the next 12 months that would not run on a 835 SoC? Heck, even targetting 835 as a minimum requirement would be crazy. The vast vast vast majority of Android phones out there are not running Qualcomm's flagship SoC.
    Buying a 845 tomorrow will only mean a somewhat faster phone (if you will be able to notice it) but you won't be able to do anything I can't do with my Moto G5S+ which is really the kind of device that makes sense buying if you like Android.
  • tuxRoller - Sunday, December 10, 2017 - link

    Since your didn't mention any qualifiers I'll toss this out: an 845 should provide a usable a/vr experience; that's not possible with the g5s+.
    Also there's 4k60 hdr, 480fps recording@720p, ability to run on device NN at low power (practically speaking, at all), etc.
    You may not be interested in any of these things but your only said "won't be able to do anything" your phone can't.
  • generalako - Monday, December 11, 2017 - link

    Absurd? You said yourself that before Ryzen Intel was very far ahead. That was what I was trying to say. AMD was basically dead in the desktop segment before Ryzen launch, with hardly any market share. And Intel's advantage was what, 60% better ST performance and not even half that in better MT performance? Apple's advantage is far bigger in ST alone, at 120%! Reply
  • Paradroid888 - Friday, January 05, 2018 - link

    > And there's no legitimate reason for why various chip makers for Android are so far behind Apple

    Well actually there is - it seems Apple has managed to build processors that are so powerful that they pull more current from the battery than even a 12-month-old iPhone can reliably manage.
  • amosbatto - Friday, January 19, 2018 - link

    Apple can charge very high prices for its products, so it can afford to pay for large die sizes in its processors. Qualcomm can only sell its Snapdragon 845 for roughly $60, so it has to keep costs down and use smaller die sizes to make a profit. Here is a good article that explains: Reply
  • yeeeeman - Thursday, December 07, 2017 - link

    Given the very fast release pace of SoCs these days and the low performance of the first Kryo - designed by Qualcomm core - they probably need a few years to rethink it and bring it back to market. In the meantime, they can just take ARM IP directly since they are good enough on each generation. Reply

Log in

Don't have an account? Sign up now