HiSilicon Announces The Kirin 980: First A76, G76 on 7nmby Andrei Frumusanu on August 31, 2018 8:30 AM EST
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- Kirin 980
This year at IFA, instead of suddenly finding the new silicon on the show floor, Huawei’s CEO Richard Yu announced this year’s new Kirin 980 during the company’s keynote speech. For readers who’ve been attentively following our articles over the last few months, today’s news should hopefully not come at too big of a surprise, as I’ve been heavily hinting at the timing of the first new 7nm Cortex A76 silicon designs coming later this year in commercial devices, with HiSilicon being the prime candidate for being the first vendor on the market with the their new generation SoC.
Huawei’s silicon design division HiSilicon has been a key strategic component for the company’s products, as it enables it to differentiate itself in a more drastic way than what we usually see from other vendors who simply rely on established open-market SoC vendors such as Qualcomm. This kind of strategy of course is a double-edged sword, as if you’re all-in with your in-house silicon, it also means that these designs must be executed properly, as otherwise you find yourself in an unfavourable competitive position.
The Kirin 950 was an impressive chip as it boasted the first Cortex A72 design on a then new TSMC 16FF manufacturing process – this paid off plenty for Huawei as the combination of new IP as a new manufacturing node resulted in a very competitive silicon which directly translated into favourable characteristics of the handsets in that it was used in.
The Kirin 960 and Kirin 970 on the other hand showcased the risky side of this strategy, and where things can go off-track – the Kirin 960 was a 16nm SoC released in a device generation where 10nm competitors such as the Snapdragon 835 and Exynos 8895 dominated. The Kirin 970 fared better when switching to a 10nm manufacturing node, but this time around HiSilicon wasn’t able to include the newest Arm CPU IP, relying on an A73 CPU while the Snapdragon 845 embraced the new A75. Furthermore the last two Kirin generations had showcased extremely uncompetitive GPU performance and efficiency figures – here HiSilicon is stuck and is at the whim of IP vendors’ ability to produce competitive designs against market leaders such as Qualcomm.
The reason as to why I reiterated what happened to the last few generations, is that this time around HiSilicon finds itself in a very favourable position where IP and manufacturing is aligned into what is essentially a best-case scenario for the new design. Arm’s new Cortex A76 and Mali G76 both promise great leaps in terms of performance and power efficiency, and TSMC is in mass production of its new 7nm manufacturing node.
Today we present the new Kirin 980, the first announced TSMC 7nm SoC as well as the first Cortex A76 and Mali G76 design:
|HiSilicon High-End Kirin SoC Lineup|
|SoC||Kirin 980||Kirin 970||Kirin 960|
|CPU||2x A76 @ 2.60 GHz
2x A76 @ 1.92 GHz
@ 512KB L2's
4x A55 @ 1.80 GHz
@ 128KB L2's
4MB DSU L3
|4x A73 @ 2.36 GHz
4x A53 @ 1.84 GHz
|4x A73 @ 2.36GHz
4x A53 @ 1.84GHz
@ 720 MHz
@ 746 MHz
|4x 16-bit CH
LPDDR4X @ 2133MHz 34.1GB/s
|4x 16-bit CH
LPDDR4X @ 1833 MHz
|4x 16-bit CH
LPDDR4 @ 1866MHz
|Storage I/F||UFS 2.1||UFS 2.1||UFS 2.1|
|ISP/Camera||New Dual ISP
|Dual 14-bit ISP||Dual 14-bit ISP
2160p30 Encode :(
Decode & Encode
|Integrated Modem||Kirin 980 Integrated LTE
DL = 1400 Mbps
3x20MHz CA, 256-QAM
(5CA no MIMO)
UL = 200 Mbps
1x20MHz CA, 256-QAM
|Kirin 970 Integrated LTE
DL = 1200 Mbps
5x20MHz CA, 256-QAM
UL = 150 Mbps
2x20MHz CA, 64-QAM
|Kirin 960 Integrated LTE
DL = 600Mbps
4x20MHz CA, 64-QAM
UL = 150Mbps
2x20MHz CA, 64-QAM
|NPU||Dual @ >2x perf||Yes||No|
|Mfc. Process||TSMC 7nm||TSMC 10nm||TSMC 16nm FFC|
The new Kirin 980 checks off all of the newest available IPs from Arm, finally employing a new DynamIQ CPU cluster configuration comprised of 4 Cortex A76's and 4 Cortex A55s.
The biggest surprise to today’s announcement for me is to see that HiSilicon has made the step forward to fully take advantage of Arm’s new DSU cluster and its asynchronous CPU configuration, and actually implement the brand new Cortex A76 into two groups, each housed in their own clock and voltage plane.
The highest performance Cortex A76 pair runs at up to 2.6GHz. This is less than Arm’s originally announced 3GHz target for the CPU, however I had warned readers to expect more conservative clocks around the 2.5GHz figure, as the higher clock rates seemingly were meant for higher TDP form-factors. Nevertheless, the new CPU microarchitecture still brings with it substantial performance improvements, and thus will still perform very well at 2.6GHz, posting leading performance for this generation.
The surprise of seeing the second pair of Cortex A76 cores running at up to 1.92GHz is actually quite fantastic news for power efficiency. Here we see HiSilicon include what is essentially a “medium” efficiency group of CPUs. Because these two cores are running on a separate clock and voltage plane to the primary performance A76 pair, it means they can operate at different efficiency points, enabling more effective power savings in varied multi-threaded operation.
Previously, quad-core clusters were running on the same clock and voltages, and if there was a single high performance thread requiring a high performance state, it meant that other medium-performance threads were forced to take a power efficiency penalty by needlessly running at this less efficient performance state. By introducing a mid-tier, this effectively eliminates such kind of overhead which is commonly found in real-world applications.
I haven’t been able to confirm this with HiSilicon as of yet, but the reduced clock of this mid pair of A76 would also strongly point out to a possibly different physical implementation with a lower silicon sign-off frequency. This means that even though both pairs of A76’s are the same IP, this mid-pair are very likely to actually be more efficient when running at the same frequency.
Finally, we see four new Cortex A55 cores as the most power-efficient workhorses of the SoC who’ll be able to take the brunt of workloads, running at up to 1.8GHz. Here again, virtue of the mid-performance cluster, HiSilicon is likely able to implement a very power-efficiency focused physical implementation for the A55’s, resulting in clock speeds that in range with current generation A53 and A55 SoCs.
Cache wise, all the Cortex A76’s come with their recommended 512KB L2 cache configurations while the A55’s employ 128KB caches. As a reminder, in the new DynamIQ cluster configuration, the L2 caches for these designs are private to each CPU core. The L3 cache in the DSU has seen a full implementation at 4MB, double that of what we’ve seen in the Snapdragon 845.
I haven’t been able to confirm the frequency of the DSU in the Kirin 980, nor if it actually has a separate clock and voltage plane of its own, here it might be possible that it’s could be on the same plane with the A55’s. Again, that’s just speculation on my part, the other possibility is that we have 4 full clock and voltage planes for the whole CPU complex.
75% higher CPU performance, 58% better efficiency compared to Kirin 970
In terms of performance gains, HiSilicon promises 75% gains over the Kirin 970, which after a bit of math actually ends up basically exactly where I had projected the A76 to land, based on Arm’s own performance claims.
The following projection is of my own, and takes into account both Arm’s and HiSilicon’s matching performance claims:
As you may have noted, the power and efficiency estimates are also included. HiSilicon proclaims that the Kirin 980 is 58% more power efficient than the Kirin 970. We haven’t been able to clarify if this means that the perf/W is 58% better at the same performance of the 970, or if the Kirin 980 has a 58% better perf/W at both SoC’s respective peak performance states. The projection assumes the latter, and it actually again it matches up with Arm’s own claims about the Cortex A76.
I’m still very very sceptical about these numbers as they seem quite fantastic; yet to date I haven’t seen any contradictory information that would actually rebuke these estimates. For the time being, until we actually get our hands on the first Kirin 980 device, take the above power and efficiency estimate with a large grain of salt.
Update Post-Keynote: During the presentation Huawei’s footnotes clarified that the efficiency figures are based on Dhrystone. Dhrystone is very CPU core enclosed and doesn’t stress the rest of the SoC nearly as much in terms of memory traffic, putting some doubts into the above estimates as well as Huawei’s power figures.
The move to a 3-tier CPU hierarchy also brings with itself complications in terms of scheduling. As we’ve seen this year, scheduling is very much a new critical component of modern SoCs as with the very high dynamic range of performance and power, using the most optimal solution is critical in extracting the best out of the silicon. Here HiSilicon promises a new “Flexible scheduling” mechanism. We unfortunately don’t have any more details on this, but it’s going to be a crucial component of the new Kirin 980.
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eastcoast_pete - Friday, August 31, 2018 - linkThanks Andrei! The next company where that question will be acute for is Qualcomm; AFAIK, they typically ship several times the volume of their snapdragon flagship SoCs compared to the top-dog Kirin, and QC wanted to go TSMC exclusievly for 7 nm. Might be interesting, given that Apple and QC have a serious beef with each other right now, so Apple could squeeze QC at the fab level.
eastcoast_pete - Friday, August 31, 2018 - linkmissing last line: ..at the fab level by ordering some more A12s just when QC wants its chips to be made.
melgross - Friday, August 31, 2018 - linkApple is estimated to be between 20-25% of TSMCs business, so likely, QC wouldn’t have a problem. And companies don’t order hundreds of million of dollars of parts out of schedule to hinder a rival.
eastcoast_pete - Friday, August 31, 2018 - linkActually, the numbers are more the other way around. eetimes published some estimates (from multiple sources) that Apple is taking around 75% - 80% of TSMC's 7 nm capacity, with Qualcomm, Huawei, AMD and everybody else getting whatever is left over. Let's not forget that Apple has what is basically a first right of refusal for TSMC's 7 nm capacity, which was a key part of them giving TSMC the exclusive for their A12 and possible others going forward. As for not ordering large inventory just to hinder a rival: Why wouldn't they (Apple)? 1. Apple and QC are arguing over billions of dollars in license fees, and 2. SoCs are definitely ordered in bulk once they are past sampling stage (comes with how they are made). Of course, I am not privy to Apple's strategy vs. QC, but Apple is known to play hardball and even dirty if that helps them win. Although, in this case, I don't exactly feel sorry for QC, either.
porcupineLTD - Saturday, September 1, 2018 - linkIsn't that capacity for 2018 only? The only products that will ship in volume in 2018 will be the A12 and Kirin 980. TSMC will expand capacity in 2019 and will start volume production of their 7nm+ in Q2-Q3. Also Apple needs a lot of chips up front (tens of millions) huawei need 10-20 million a year and I believe qualcom needs a number similar to apple (even if there are more android sales than iphone only a tiny fraction of those have flagship socs and an significant part of those are Kirin and Exynos) so with the usual release of flagship android phones in Q2-Q3 2019 there should be no problem.
eastcoast_pete - Saturday, September 1, 2018 - linkThe 75-80% for Apple is for 2018, AFAIK. Huawei will likely be okay, while they ship a lot of phones, they don't/won't sell most of them with 980s inside, and had apparently reserved ahead of time. The situation is different for QC: a lot of "flagship" Android phones (almost all bound for the US) are equipped with the respective top snapdragon, so their volume requirements are bigger. The eetimes analysis suggests that QC will get about the same sliver of TSMC's 7 nm capacity as Huawei, but QC will want a lot more chips that that, and they didn't want to wait for Samsung to come online. They may not have much choice now, though. Also, while 2019 might well bring a more relaxed supply situation, if you're hoping to ship your new flagship phones in 2018, you'll need those SoCs to start coming in about now.
The 7 nm capacity crunch has become a game of musical chairs, and now the music has stopped as GloFo out of it altogether, so there will be some fabless customers left standing. The main one is likely AMD, I believe it's unlikely we'll see 7 nm VEGAs on 7 nm anytime soon. With QC, I wouldn't be surprised if a number of their execs are flying to South Korea a lot these days.
Speedfriend - Monday, September 3, 2018 - linkGiven that Apple didn't order extra SOC test machines this year, the A12 is probably coming in smaller numbers than the A11....
iwod - Saturday, September 1, 2018 - linkHighly unlikely to near impossible. Apple would not know the total capacity TSMC had for 7nm, and how will TSMC handle their 7nm expansion if Apple decide to take over whatever capacity they had, which has nothing to do with Apple. Not to mention Qualcomm second source with Samsung incase anything happens to TSMC.
V900 - Monday, September 3, 2018 - linkGiven that Apple has more or less paid for TSMCs 7nm fabs, it’s rather likely that they know exactly the capacity, actually.
Speedfriend - Monday, September 3, 2018 - linkThat assumes that the A12 will be in all the new phones released this year. I believe that they are sitting on large amounts of A11 chips so they might show up in the LCD model as a differentiator?