800 VDC Power Architecture

Overview

The 800 VDC power architecture is a next-generation data center power distribution approach where a dedicated sidecar power rack generates 800 V DC and distributes it to adjacent IT racks. The higher voltage dramatically reduces current for the same power level, cutting distribution losses at megawatt-scale GPU infrastructure where 50 VDC would require impractically high bus bar currents.

In the LITEON implementation as of 2025: a 14 RU AC PDU accepts three-phase 415–480 Vac input via 16 × 160A AC whips and feeds 16 sets of 2RU 100 kW power shelves (32 RU total), outputting 800 VDC to connected IT racks at a rated 1.2 MW under 4-to-make-3 redundancy. IT racks receiving 800 VDC use dedicated 90 kW DC-input shelves converting 800 VDC back to 50 VDC for GPU compute. Safety features include 800 VDC touch-proof design, emergency shutdown, remote monitoring, remote control, and online firmware update. Mature samples of the LITEON 1.2 MW power rack target early 2026 delivery.

The 800 VDC standard was co-developed by NVIDIA, Meta, Microsoft, Google, and Delta Electronics for AI rack loads exceeding 1 MW, and is a key topic within the OCP power workstream.