NVIDIA 800V vs OCP Mt Diablo: two references, not two architectures
NVIDIA's 800V HVDC architecture and OCP Mt. Diablo v0.7.0 are frequently discussed as competing "architectures" for AI data centre power. They are not. NVIDIA describes what its next-generation reference designs assume at the FACILITY feed (Layer 2-3 upstream); Mt. Diablo specifies how the RACK-LEVEL (Layer 4) is built to accept that feed. Both are needed together.
01Bottom-line verdict
02Comparison table
| NVIDIA 800V HVDC | OCP Mt. Diablo v0.7.0 | |
|---|---|---|
| Author / forum | NVIDIA reference architecture guidance | OCP Rack + Power working group |
| Layer addressed | Layer 2-3 (facility distribution) | Layer 4 (rack-level power conversion) |
| Voltage scope | MV-to-800V DC facility feed | 800V DC to 48V DC rack conversion |
| What is specified | Reference architecture pattern + design assumptions | Physical + electrical + mechanical rack spec |
| Governance | NVIDIA-published guidance (not open standard) | Open Compute Project, 80+ ecosystem partners |
| First published | NVIDIA blog + reference designs 2025-2026 | Mt. Diablo v0.7.0 March 2026 |
| Compatible with each other | Yes; the facility feed pattern matches Mt. Diablo rack input | Yes; rack accepts 800V DC facility feed |
| Vendor ecosystem | Flex + Delta + Vertiv + others building to NVIDIA reference | Wiwynn + Foxconn + Inventec + Quanta + others build Mt Diablo racks |
03Decision framework
Choose NVIDIA 800V HVDC when
- Building an AI facility for NVIDIA next-gen accelerators. The facility-side reference architecture is NVIDIA-led
- Working with NVIDIA reference-design integrator. Their design assumes NVIDIA facility-feed guidance
- Evaluating specific product compatibility. NVIDIA guidance covers what accelerator systems expect
Choose OCP Mt. Diablo v0.7.0 when
- Specifying the Layer 4 rack + power shelf. Mt. Diablo is the open spec for this layer
- Sourcing from OCP-ecosystem rack OEMs (Wiwynn, Foxconn, etc.). Their products are Mt. Diablo-compliant
- Building multi-vendor procurement strategy. Open spec enables cross-vendor compatibility
- Accelerator-agnostic infrastructure planning. Mt. Diablo works with non-NVIDIA silicon too
04Deep-dive research
05Primary sources
06Frequently asked
Do I have to choose one?
No. If you're building NVIDIA-based AI infrastructure at hyperscaler scale you typically use both together. NVIDIA guides Layer 2-3; Mt. Diablo specifies Layer 4.
What if I'm not building for NVIDIA accelerators?
Mt. Diablo still applies as the Layer 4 open standard. The facility-side guidance may come from OCP or the specific accelerator vendor (AMD, Google TPU, etc.).
Is there tension between NVIDIA-led guidance and OCP open spec?
Practical answer: not much in the current 2026 window. Both are converging on 800V DC + sidecar rack pattern. The tension is more governance-shape (NVIDIA-published vs open-standard) than technical.
What is the future beyond Mt. Diablo v0.7.0?
1500V DC (facility feed) + higher rack density are in scope for future OCP work. See Supplement C on the voltage ceiling.