OCP MGX 1.2 Accelerated Computing Rack and Trays Design Specification, revision 1.2.0 (NVIDIA contribution): maximum rack power dissipation, with a 48 VDC nominal liquid-cooled busbar rated to 5,000 A and IT payload up to 4,000 lb
250 kWobserved
| 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 | Specification ceilings, not a measured or shipping rack. Busbar 40–59.5 VDC, rated 5,000 A at 40 °C ambient, cooled with PG25 through an MQD-04 coupler (17–45 °C inlet). Rack liquid: up to 350 L/min, 85% liquid heat capture, 5 bar(g) max operating. Trays blind-mate on UQD-08/UQDB-08 2.0.0. Power shelves, CDUs and TOR switches are out of scope. Derived from, but not fully compatible with, MGX rev. 1.1 (2024-08-29). NVIDIA contributed its Vera Rubin rack and compute-tray designs through this specification (NVIDIA, 2026-10-12). NVIDIA DSX's 330 kW Vera Rubin cabinet figure is a separate facility basis; OEM operating profiles (188 kW Max Q / 228 kW Max P) sit inside 250 kW. |
| As of | 2026-10-06 |
| Source | Open Compute Project, MGX 1.2 Accelerated Computing Rack and Trays Design Specification, Revision 1.2.0, effective October 6, 2026 · Version history p. 2; §5.2 (4,000 lb IT payload); §6 and §6.1 (48 VDC, 5,000 A); Table 4 (busbar cooling); Table 9 (250 kW max rack power dissipation) |
| Review | checking…review by 2027-04-06 · standard cadence |
| Recorded changes | last 2026-10-17 |
| Claim id | ocp-mgx-1-2-rack-trays-spec-250-kw |
Where the guide uses it
← Full numbers register — every date-stamped figure in the guide, with revision history.