Mt. Diablo
OCP's Mt. Diablo power-rack specification (Microsoft, Meta, Google; final 1.0.0, October 2026; formerly Diablo 400) uses a bipolar ±400 VDC bus about a midpoint, which it calls differential 800 VDC. It is distinct from NVIDIA's announced unipolar 800 VDC rack architecture; do not merge the two profiles.
Also written as: Mt Diablo · Diablo 400
Current numbers
±400 VDCOCP Mt. Diablo bipolar ±400 V rail, chosen to ride the EV supply chain
800 VDC two-wire PSU option (isolated from PE)Mt. Diablo 1.0.0: only the two-wire PSU option is isolated from PE; the ±400 V output is midpoint-bonded (Ch 4.7)
1.0.0OCP Mt. Diablo (formerly Diablo 400) sidecar power-rack spec: differential 800 VDC; one power rack spans 800 kW–1 MW+