VAC · Volts alternating current
The unit naming conventional AC distribution down to server power supplies, the incumbent baseline that facility-level DC architectures are measured against.
Current numbers
157%more power through the same wire gauge moving from 415 VAC to 800 VDC distribution (NVIDIA's October 2025 comparison)
+157%NVIDIA's power gain in one wire gauge when 3-wire DC (POS/RTN/PE) replaces 4-conductor 415 VAC (Oct 2025; May 2025: ~85%)