Comments on: 20 Petaflop Titan Super at ORNL to be Accelerated with 18,000 Nvidia GPUs http://insidehpc.com/2011/10/11/20-petaflop-titan-super-at-ornl-to-be-accelerated-with-18000-nvidia-gpus/ HPC News Without the Noise for Supercomputing Professionals | insideHPC Fri, 03 May 2013 04:44:25 +0000 hourly 1 http://wordpress.org/?v=3.1.1 By: RichB http://insidehpc.com/2011/10/11/20-petaflop-titan-super-at-ornl-to-be-accelerated-with-18000-nvidia-gpus/#comment-374317 RichB Wed, 12 Oct 2011 00:17:16 +0000 http://insidehpc.com/?p=23735#comment-374317 Jeff, I believe the power consumption numbers are for the overall system including storage. Peak numbers are based on future Kepplar GPUs, which reportedly have a similar power envelope to today's devices. Jeff, I believe the power consumption numbers are for the overall system including storage. Peak numbers are based on future Kepplar GPUs, which reportedly have a similar power envelope to today’s devices.

]]> By: Jeff Hammond http://insidehpc.com/2011/10/11/20-petaflop-titan-super-at-ornl-to-be-accelerated-with-18000-nvidia-gpus/#comment-374314 Jeff Hammond Tue, 11 Oct 2011 19:27:50 +0000 http://insidehpc.com/?p=23735#comment-374314 The K supercomputer has 10.725 PF peak and 8.126 LINPACK Rmax for 9.89 MW, which is 1.084 GF(Peak)/W or 0.825 GF(Rmax)/W (http://www.top500.org/system/performance/10810). Cray's own slides say the XK6 will achieve ~1.2 GF(Rmax)/W (http://www.ena-hpc.org/talks/oed-slides.pdf). Public data on the NVIDIA X2090 and AMD 6200 suggest 2.5 GF(Rmax)/W or >3.25 GF(Peak)/W. Either Cray is off by more than a factor of two in their GF(Rmax)/W predictions or they are going to do more than 50% better than the best possible GF(Peak)/W one can derive from available data. Furthermore, to do 20 PF peak at >3.25 FW(Peak)/W means Titan will use less than 6.15 MW, which is inconsistent with the claim above that Jaguar does 7-10 MW and Titan will be similar. In conclusion, the numbers in this article just don't add up. The K supercomputer has 10.725 PF peak and 8.126 LINPACK Rmax for 9.89 MW, which is 1.084 GF(Peak)/W or 0.825 GF(Rmax)/W (http://www.top500.org/system/performance/10810).

Cray’s own slides say the XK6 will achieve ~1.2 GF(Rmax)/W (http://www.ena-hpc.org/talks/oed-slides.pdf). Public data on the NVIDIA X2090 and AMD 6200 suggest 2.5 GF(Rmax)/W or >3.25 GF(Peak)/W. Either Cray is off by more than a factor of two in their GF(Rmax)/W predictions or they are going to do more than 50% better than the best possible GF(Peak)/W one can derive from available data.

Furthermore, to do 20 PF peak at >3.25 FW(Peak)/W means Titan will use less than 6.15 MW, which is inconsistent with the claim above that Jaguar does 7-10 MW and Titan will be similar.

In conclusion, the numbers in this article just don’t add up.

]]>