Nvidia Staffer Calls Microsoft's Blackwell Cooling Wasteful
An internal Nvidia email in early fall said Microsoft's cooling approach for GB200 Blackwell deployments appears "wasteful," while providing flexibility and fault tolerance. The memo described two GB200 NVL72 racks (72 GPUs each) using server liquid cooling plus a building-level air-cooled system; experts say air cooling uses more energy but conserves water. Microsoft says its closed-loop heat exchanger optimizes heat dissipation and power delivery for AI workloads.
Key Points
- 1Describes installation of two GB200 NVL72 racks, each with 72 GPUs, using liquid cooling
- 2Explains Microsoft's hybrid setup reduces water use but increases energy consumption at facility scale
- 3Signals engineers must balance energy, water, and operational flexibility when deploying hyperscale AI racks
Scoring Rationale
Provides practical infrastructure insight with direct vendor quotes, but limited novelty and narrow, company-specific scope.
Sources
Public references used for this report.
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