What PSU do you need for an RX 7900 XTX?
The RX 7900 XTX draws up to about 355W under full load. On its own that only tells half the story — your total system power (and so the PSU you need) depends just as much on your CPU, drives and cooling. This page sizes a supply for the RX 7900 XTX paired with a Ryzen 7 9800X3D; if your parts differ, the calculator gives your exact number in seconds.
Paired with a Ryzen 7 9800X3D, this build draws about 565W at peak (355W GPU + 120W CPU + system). A 1200W unit runs it at ~47% load. Absolute minimum: 700W.
| GPU RX 7900 XTX | 355W |
| CPU Ryzen 7 9800X3D | 120W |
| Motherboard + RAM + drives + fans Rest of system | 90W |
| Total peak draw | 565W |
Recommended power supplies
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FAQ
Is a 700W PSU enough for an RX 7900 XTX?
It's the bare minimum, but we'd recommend 1200W. This build peaks around 565W, and a 1200W unit keeps it near 55% load — the efficiency sweet spot — with headroom for the GPU's transient spikes.
What efficiency rating should I get for an RX 7900 XTX?
80+ Gold or Platinum. It's the best balance of price and efficiency for a build this size. Never pair a good GPU with a cheap unrated PSU.