Mt Diablo
An OCP/NVIDIA initiative defining an 800 VDC sidecar power architecture for megawatt-class AI racks.
Current numbers
±400 / 800 VDCDC bus voltages replacing the grounded 415/480 VAC neutral at high rack power (Mt Diablo / Diablo 400 is bipolar ±400 V about a grounded midpoint; NVIDIA / OCP 800 VDC designs run ungrounded/HRG or midpoint-referenced — see Ch 4.7)