Mt Diablo
OCP/Meta's Mt Diablo rack-power architecture uses a bipolar ±400 VDC bus about a midpoint (800 V rail-to-rail). It is distinct from NVIDIA's announced unipolar 800 VDC rack architecture; do not merge the two profiles.
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)