Publication
IBM J. Res. Dev
Paper

Summit and Sierra supercomputer cooling solutions

IBM J. Res. Dev
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Abstract

Achieving optimal data center cooling efficiency requires effective water cooling of high-heat-density components, coupled with optimal warmer water temperatures and the correct order of water preheating from any air-cooled components. The Summit and Sierra supercomputers implemented efficient cooling by using high-performance cold plates to directly water-cool all central processing units (CPUs) and graphics processing units (GPUs) processors with warm inlet water. Cost performance was maximized by directly air-cooling the 10% to 15% of the compute drawer heat load generated by the lowest heat density components. For the Summit system, a rear-door heat exchanger allowed zero net heat load to air; the overall system efficiency was optimized by using the preheated water from the heat exchanger as an input to cool the higher power CPUs and GPUs.

Date

01 May 2020

Publication

IBM J. Res. Dev

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