NVIDIA GB200 NVL72 (QCT QoolRack reference) maximum liquid inlet and return temperatures
45 °C maximum liquid inlet; 65 °C maximum liquid return (separate limits)observed
| Value kind | observed — Reported measurements, counts, and specifications keep the precision and scope stated by their source; an exact specification is not treated as a range. |
|---|---|
| Scope | Exact QCT reference. The 45 °C liquid-inlet maximum and 65 °C liquid-return maximum are separate limits, not a prescribed 20 K operating rise. Select a supported operating point, approved fluid, liquid heat load, and design ΔT; ASHRAE W45 describes FWS supply capability, not this product's setpoint. |
| Caveat | Separate acceptance maxima, not a prescribed 20 K operating rise; do not attribute these limits to HPE without an HPE document that states them. |
| As of | 2025-04 |
| Source | QCT, QoolRack Stand-Alone Advanced Liquid Cooling for NVIDIA GB200 NVL72 Systems · PDF p.3, 'NVIDIA GB200 NVL72 Specs': maximum liquid inlet 45 °C; maximum liquid return 65 °C |
| Review | checking…review by 2027-08-24 · slow cadence |
| Recorded changes | last 2026-08-24 · 3 revisions tracked |
| Claim id | gb200-nvl72-dlc-coolant-envelope-rack-accepts-2 |
Where the guide uses it
- 1.2 Training Data Centers: Synchronous, Dense, Checkpointable
- 1.7 The Requirements-and-Consequences Matrix
- 5.1 Thermal Fundamentals & the Density Wall
- 5.4 Direct-to-Chip Liquid Cooling (DLC) — Architecture, Fluid & Thermal Design
- 5.7 Facility Water Loops & Warm-Water Cooling
- 13.2 Documentation, Scripts & Acceptance Test Plans
- 13.5 Cooling Acceptance: Air, Liquid-to-Chip & CDU Commissioning
- 13.6 Level 5 Integrated Systems Testing (IST) & Failure-Mode Demonstration
- 14.2 DCIM, Telemetry & Observability for GPU-Dense, Liquid-Cooled Facilities
- 14.5 Predictive & Preventive Maintenance of Power and Cooling Plant
- 14.13 Agentic Ops, RL Control & the Autonomy Ladder
- 15.2 Energy Efficiency: Cooling, Free Cooling, Setpoints & Power-Chain Losses
- F Failure-Mode / FMEA Catalog
← Full numbers register — every date-stamped figure in the guide, with revision history.