Hot Chips 2020 Live Blog: Intel's Tiger Lake Mobile CPU (12:30pm PT)by Dr. Ian Cutress on August 17, 2020 3:30 PM EST
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- Live Blog
- Tiger Lake
- Hot Chips 32
03:31PM EDT - Tiger Lake - generational improvement for graphics and CPU
03:31PM EDT - From 9W to 65W
03:32PM EDT - New AI features for new workloads
03:32PM EDT - USB4, PCIe4, TB4
03:32PM EDT - Increased power efficiency
03:33PM EDT - More cache, more performance, better efficiency, more headroom, more features
03:34PM EDT - New process technology
03:34PM EDT - new transistor
03:34PM EDT - SuperFin
03:35PM EDT - optimized non-perf critical IPs for the new transistor to allow for more headroom for the perf-critical stuff
03:35PM EDT - Improved Metal Stack
03:35PM EDT - To new high perf layers at the top
03:36PM EDT - New SuperMIM
03:36PM EDT - Here's the high level diagram
03:36PM EDT - Different power envelopes might have different amount of cores
03:36PM EDT - (which means 8 core is coming later at 65 W)
03:37PM EDT - Four Willow cove cores, 96 EUs of Xe graphics
03:37PM EDT - LPDDR5-5400 support, PCIe 4.0 x4
03:37PM EDT - 12 MB non-inclusive L3
03:37PM EDT - 1.25 MB non-inclusive L2
03:37PM EDT - 4x4K display pipes
03:38PM EDT - IPU6 - two different flavors based on the chip config (?!?)
03:38PM EDT - Improved Debug
03:39PM EDT - GNA 2.0 does up to 38 GigaOPs, 1 GOP per watt (and it scales)
03:40PM EDT - Better FIVR
03:41PM EDT - Total Memory Encyption support
03:41PM EDT - Willow Cove in Tiger Lake
03:41PM EDT - Built on Sunny Cove base
03:42PM EDT - Had three options - IPC, improve circuits on freq for SuperFin, or a mix
03:42PM EDT - The second was used - focus on frequency
03:42PM EDT - Also cache adjustments and security
03:43PM EDT - Willow Cove has a better dynamic range - better perf/watt at all points and much higher voltage/freq
03:44PM EDT - Now to 96 EUs
03:44PM EDT - More info on Xe later
03:45PM EDT - Increased bandwidth
03:45PM EDT - Dual ring architecture
03:45PM EDT - IO caching
03:46PM EDT - Up to 86 GB/s on DRAM
03:47PM EDT - Increased display support - but depends on memory configurations. Added dedicated fabric path to memory, up to 64 GB/s
03:48PM EDT - PCIe 4.0 at 8 GB/s
03:48PM EDT - 100ns less latency for CPU attach compared to PCH attach
03:48PM EDT - Integrated TB4 and USB4, full compliance
03:48PM EDT - Display via Type-C using DP tunneling over TB
03:50PM EDT - Overall better power management for better idle power and quicker entry/exit
03:50PM EDT - DVFS on fabric
03:52PM EDT - More than a generational improvement in a single product cycle
03:53PM EDT - Q&A time
03:54PM EDT - Q: Only 4 CPU cores? What's the range? A: Will depend on the SKU config, announced in product launch in September.
03:54PM EDT - Q: Additional latency for TME? A: No disclosing.
03:54PM EDT - Q: Perf impact of TME? A: See the product launch at Sep 2
03:55PM EDT - Q: BW of TME? A: No loss of BW
03:55PM EDT - Q: PL2? A: See Sep 2 product launch.
03:56PM EDT - Q: Is incoming PCIe traffic cached in LLC? A:You can.
03:56PM EDT - Q: What sort of frequency is DVFS? A: No hard numbers. We sample the utilization and we can offer a fine granularity. (so once per hour?)
03:57PM EDT - Q: L2 latency with increased cache size? A: No answer.
03:58PM EDT - Client have always used L3 is inclusive - we now use non-inclusive. Once you grow that L2 cache to 1.25 MB, making L3 inclusive would consume 5 MB.
03:59PM EDT - Now there's an hour break for lunch, before Raja's keynote. Come back then!
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frbeckenbauer - Monday, August 17, 2020 - link65 watts for 4 cores, 2012 has called
mikk - Monday, August 17, 2020 - link65W refers to 8 core TGL-H.
e36Jeff - Monday, August 17, 2020 - link65W still isnt great for 8 cores. Considering AMD is as low as 10W for 8 cores...
Klinbo - Monday, August 17, 2020 - link4900H is 54W for 8 cores
Eulytaur - Monday, August 17, 2020 - linkThe 4800*U* has a cTDP of 10W
ikjadoon - Monday, August 17, 2020 - linkAnd it runs like a 10 W processor... Zen2 perf/watt hasn't changed.
Valantar - Tuesday, August 18, 2020 - linkThe 4800U is a powerhouse for its wattage class, and still matches Intel's best in the same class for single core perf.
As for the 4900H, it's 45W with an optional 54W mode, and you might as well look at the 35W HS series if you're focusing on other TDPs. Intel has nothing to match this.
As for these 65W chips, I'm sincerely hoping they are talking about an optional cTDP-up for 45W chips like they have been providing for years already. If the new H-series is 65w only... Oh dear.
Fulljack - Tuesday, August 18, 2020 - linkthankfully OEMs already learned the cooling solution with Intel high power usage for 45W CFL-H and CML-H ;)
jokes aside, the same sadly can't be said the same for 45W Renoir. it seems like OEMs couldn't put great cooling solution while also using 45W Renoir chip.
oleyska - Monday, August 17, 2020 - link54W is turbo for almost 10 minutes, then 45W.
54W is also the upper limit by design it seems, only one I know of which does more is XMG(tongfan or what it's called) does 72W.
Spunjji - Tuesday, August 18, 2020 - link"If I compare the high-TDP CPU, I can pretend the 15W versions don't exist"
You, a clown.