GRID → CHIP

How electricity flows from the utility grid down to a chip

From 415 V AC to 800 V DC — and toward 1500 V DC

Every watt a chip consumes starts as high-voltage AC at a power plant hundreds of miles away. In a traditional 415 V AC hall, that feed is stepped down, conditioned by a double-conversion UPS, and rectified in the rack to a 54 V or 12 V bus. A point-of-load regulator then makes the sub-1 V core rail the chip actually uses. The diagram counts that path as seven stages, including transmission and the hall busway, which are not conversions. NVIDIA's 800 V DC architecture, targeted at 1 MW racks from 2027, collapses the low-voltage transformer, the AC UPS, and the rack AC→DC stage into one medium-voltage rectifier. 1500 V DC sits at the usual top of the low-voltage class (IEC 62477-1 stops at 1500 V DC; the NEC treats anything above 1500 V DC as high voltage) and is already common in utility-scale solar and rail. NVIDIA's white paper lists it as a potential later target, and OCP's LVDC work discusses it as a progression. It is not required to reach multi-megawatt racks — NVIDIA's 800 V DC design is meant to scale past 1 MW.

Traditional — 415 V AC

Multi-stage AC distribution

Standard data-center distribution (480 V in US)
Stages
7
End-to-end
~81.8%
↓Transition↓
Emerging — 800 V DC

Facility-level DC distribution

Next-generation high-density racks
Stages
6
End-to-end
~84.8%
↓Longer-term option↓
Exploratory — 1500 V DC

1500 V DC, still in the low-voltage class

Potential later target in NVIDIA's white paper and OCP LVDC
Stages
6
End-to-end
~83.9%
Traditional (415 V AC)
~81.8%
7 stages · up to ~200 kW per rack
→ +3.0 pts · −45% Cu
Emerging (800 V DC)
~84.8%
6 stages · 1 MW racks from 2027
→ −0.9 pts · −45% Cu
Future (1500 V DC)
~83.9%
6 stages · multi-MW racks, exploratory

End-to-end percentages are the product of the stage efficiencies in that path. The 1500 V stage efficiencies are illustrative; NVIDIA and OCP have not published a measured chain efficiency for that path. The copper figures are separate: NVIDIA reports about 45% less copper from 415 V AC to 800 V DC, and its cable comparison shows about 45% less copper for 1500 V DC than for 800 V DC at the same power (3.1 versus 1.7 kW/mm²).