Today at their 2016 GPU Technology Conference, NVIDIA announced the first of their Pascal architecture powered Tesla cards, the Tesla P100. The P100 is the first major update to the Tesla HPC family since the launch of the first Kepler cards in late 2012, and represents a very sizable performance increase for the Tesla family thanks to the combination of the smaller 16nm manufacturing process and the Pascal architecture.

NVIDIA Tesla Family Specification Comparison
  Tesla P100 Tesla K80 Tesla K40 Tesla M40
Stream Processors 3584 2 x 2496 2880 3072
Core Clock 1328MHz 562MHz 745MHz 948MHz
Boost Clock(s) 1480MHz 875MHz 810MHz, 875MHz 1114MHz
Memory Clock 1.4Gbps HBM2 5Gbps GDDR5 6Gbps GDDR5 6Gbps GDDR5
Memory Bus Width 4096-bit 2 x 384-bit 384-bit 384-bit
Memory Bandwidth 720GB/sec 2 x 240GB/sec 288GB/sec 288GB/sec
VRAM 16GB 2 x 12GB 12GB 12GB
Half Precision 21.2 TFLOPS 8.74 TFLOPS 4.29 TFLOPS 6.8 TFLOPS
Single Precision 10.6 TFLOPS 8.74 TFLOPS 4.29 TFLOPS 6.8 TFLOPS
Double Precision 5.3 TFLOPS
(1/2 rate)
2.91 TFLOPS
(1/3 rate)
1.43 TFLOPS
(1/3 rate)
213 GFLOPS
(1/32 rate)
GPU GP100
(610mm2)
GK210 GK110B GM200
Transistor Count 15.3B 2 x 7.1B(?) 7.1B 8B
TDP 300W 300W 235W 250W
Cooling N/A Passive Active/Passive Passive
Manufacturing Process TSMC 16nm FinFET TSMC 28nm TSMC 28nm TSMC 28nm
Architecture Pascal Kepler Kepler Maxwell 2

Powering the Tesla P100 is a partially disabled version of NVIDIA's new GP100 GPU, with 56 of 60 SMs enabled. GP100 is a whale of a GPU, measuring 610mm2 in die size on TSMC's 16nm FinFET process and composed of 15.3B transistors. It is remarkable in and of itself that NVIDIA and TSMC are in volume production of such a large 16nm die at this time, as everything else we've seen with a confirmed size is at best one-quarter of this size. GP100 is being produced on TSMC's Chip-On-Wafer-On-Substrate technology, with this line apparently being used for putting the GPU and HBM2 DRAM stacks on the same interposer.

We'll dive into the full Pascal architecture (as implemented by GP100) at a later time, but it's worth noting that Pascal here is 64 FP32 CUDA cores per SM, versus 128 on Maxwell. Each of those SMs also contains 32 FP64 CUDA cores - giving us the 1/2 rate for FP64 - and new to the Pascal architecture is the ability to pack 2 FP16 operations inside a single FP32 CUDA core under the right circumstances. With a boost clock of 1.48GHz, altogether Tesla P100 will offer 10.6 TFLOPS of FP32 performance or 5.3 TFLOPS of FP64 performance, more than doubling and tripling Tesla K40's rated throughput on these metrics respectively. NVIDIA has been happy to crow about the performance of Tesla P100, and for good reason, as this stands to be a very powerful processor.

Paired with the GP100 GPU on Tesla P100 is 16GB of HBM2 VRAM, laid out in 4 stacks for a 4096-bit memory bus. NVIDIA quotes P100 as offering 720GB/sec of memory bandwidth, which works out to a memory clock of 1.4Gbps. As we've seen with other HBM products, this marks a significant increase in memory bandwidth, more than doubling NVIDIA's last generation of cards.

In their announcement, NVIDIA also confirmed that Tesla P100 will support NVLink, with 4 NVLink controllers. Previously announced, NVLink will allow GPUs to connect to either each other or to supporting CPUs (OpenPOWER), offering a higher bandwidth cache coherent link than what PCIe 3 offers. This link will be important for NVIDIA for a number of reasons, as their scalability and unified memory plans are built around its functionality.

Speaking of functionality, Tesla P100 and the underlying GP100 GPU is a full-featured HPC GPU. It supports all of the HPC-centric functionality that the Tesla K20/40/80 embodied, including ECC memory protection for the register file, caches, and HBM2 DRAM. Coupled with the very high FP64 rate, and it's clear that this is the successor of the GK110/GK210 GPU.

NVIDIA's pictures also confirm that this is using their new mezzanine connector, with flat boards no longer on perpendicular cards. This is a very HPC-centric design (I'd expect to see plenty of PCIe cards in time as well), but again was previously announced and is well suited for the market NVIDIA is going after, where these cards will be installed in a manner very similar to LGA CPUs. The P100 is rated for a TDP of 300W, so the cooling requirements are a bit higher than last-generation cards, most of which were in the 230W-250W range.

Finally, in its initial implementation NVIDIA is focusing on customers that need extreme scaling capabilities, and I wouldn't be too surprised if this was in part due to the margins of that market and how these initial cards will be in demand. NVLink of course plays a big part here, with NVIDIA able to go up to 8-way configurations thanks to it.

Source: NVIDIA

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  • xrror - Tuesday, April 5, 2016 - link

    I think that's kinda what they did here ;) Reply
  • Lanskuat - Tuesday, April 5, 2016 - link

    It seems it's a special math GPU for double precision computing only for Tesla cards, not for gamer cards, because it have too low CUDA cores here. If we just imagine Geforce 780Ti or 980Ti with such number of cores as GP100, it will be a small ~9-10 billion transistors chip, then raise core clock to 1.4GHz and we get the same single precision performance.

    However 1.4GHz on such Teslas is great! So gamer boards will work at about 1.5GHz, which is about 30% higher then on 28nm.
    Reply
  • hammer256 - Tuesday, April 5, 2016 - link

    Yeah, I would not be surprised if the consumer Pascal runs at 96 or 128 FP32 cores and 8 (4?) FP64 cores per SM. That would be rather interesting... Reply
  • nevcairiel - Tuesday, April 5, 2016 - link

    I doubt such a drastic architecture change is going to occur. They practically just sliced SMs into half compared to Maxwell, doubling their count and giving them half the cores. That has certain advantages of offering more registers and supporting more warps in parallel. Reply
  • nevcairiel - Tuesday, April 5, 2016 - link

    Infact the number of cores per SM has been gradually going down, from 192 in Kepler, to 128 in Maxwell and 64 now in Pascal. Reply
  • hammer256 - Tuesday, April 5, 2016 - link

    Yeah, you are right. They'll probably simply cut down the number of FP64 cores in the GP104 die like they did with GK104. 64 cores/SM is definitely a welcome change for compute purposes... Reply
  • extide - Tuesday, April 5, 2016 - link

    Anyone know if they are using 3D vs 2.5D? I know Jen Hsun said 3D, but that would mean that the memory chips are on top of the GPU as opposed to next to it, like with Fiji. Putting memory chips on top of a very hot GPU seems like not such a great idea. Reply
  • T1beriu - Tuesday, April 5, 2016 - link

    He was talking about HBM. Reply
  • extide - Thursday, April 7, 2016 - link

    Yeah, so am I... Reply
  • ImSpartacus - Tuesday, April 5, 2016 - link

    Yeah, isn't that more of a mobile-friendly sort of thing? Reply

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