High-Power GPU Rack: Hybrid Cooling

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Presentation transcript:

High-Power GPU Rack: Hybrid Cooling 11/29/2018

Rear Door Heat Exchanger Side View Front View Overview Rack Rear Door Heat Exchanger Does hybrid cooling make sense for a dense / hypothetical GPU rack? Rack power ~34kW GPU chassis (JBOG) power ~4kW (qty: 8) 8x GPUs @ 450W each (liquid-cooled; 2x GPUs in series only) ~225W of ancillary power (air-cooled) Proportion of rack power by cooling Air-cooled: ~4.5kW (16%) Liquid-cooled: ~28.5kW (84%) Liquid returning to cold plates cooled by RDHx Caveat(s) CDU not shown here; ~4U space required Analysis meant to highlight capability only

Connections between manifolds, RDHx and CDU RDHx mounted to rack Loop Connections Cold plate  Hot manifold  RDHx  CDU  Cold Manifold  Cold plate… GPU chassis with open-loop cold plates Connections between manifolds, RDHx and CDU

Rear Door Heat Exchanger Rack Rear Door Heat Exchanger Side View Functioning Operating assumptions Rack power ~34kW Air-cooled: ~4.5kW (16%) Liquid-cooled: ~28.5kW (84%) Airflow through RDHx / rack: 3000CFM Inlet air to rack: 35°C; sea-level Approach temperature of RDHx ~13°C Air 35°C Air 55°C 5°C 12°C Tw,in @ 51°C Preheat ~3°C Operating Margins on GPUs