per Rubin Ultra Kyber rack (NVL144) on 800 VDC
~600 kWforecastcontested
| Value kind | forecast — Forecasts are time-bound outlooks, not specifications; test decisions across plausible scenarios. |
|---|---|
| Caveat | NVIDIA's published figure (GTC 2025) is 600 kW per Rubin Ultra Kyber rack and GTC 2026 did not revise it. SemiAnalysis (2026-05-26) reports Kyber Ultra 'approaching 660 kW' — a single-source analyst estimate, recorded here rather than adopted, since the vendor primary figure still stands. Timing contested: SemiAnalysis (July 2026) reports Kyber NVL144 delayed to 2028 on PCB-midplane manufacturability; NVIDIA says its roadmap is intact and has not published a revised date. |
| As of | H2 2027 roadmap (GTC 2025); 2028 reported July 2026 |
| Source | NVIDIA GTC (Jensen Huang); DCD, Tom's Hardware |
| Review | checking…review by 2027-03-31 · standard cadence |
| Recorded changes | last 2026-10-05 · 2 revisions tracked |
| Claim id | per-rubin-ultra-kyber-rack-nvl144-on-800-vdc |
Where the guide uses it
- 0.2 How to Read This Guide: Decisions, Consequences & Reference Data
- 1.1 The Archetype Decision Framework: Workload Is the Master Variable
- 1.2 Training Data Centers: Synchronous, Dense, Checkpointable
- 4.6 LV Distribution: Busway, PDUs, RPPs & Rack Power
- 4.7 The DC Power Revolution: 48V → ±400V → 800V & Disaggregated Sidecar Power
- 5.1 Thermal Fundamentals & the Density Wall
- 6.1 Building Typologies & Data-Hall Layout
- 6.2 Structural & Civil Engineering for Dense Liquid-Cooled Halls
- 6.7 Rack Civil Integration: Mass, Floor-Loading & Seismic Anchoring
- 7.2 NVIDIA Accelerators: Hopper → Blackwell → Vera Rubin → Rubin Ultra → Feynman
- 7.13 The Rack as Integration Unit
- 13.3 Electrical Power Acceptance (L3/L4)
- B Reference Designs & Worked Examples
← Full numbers register — every date-stamped figure in the guide, with revision history.