What PSU do you need for an RTX 4080?
The RTX 4080 draws up to about 320W 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 RTX 4080 paired with a Ryzen 7 7800X3D; if your parts differ, the calculator gives your exact number in seconds. This card also uses the newer 12V-2x6 (12VHPWR) power connector, so an ATX 3.1 supply is the safe choice.
Paired with a Ryzen 7 7800X3D, this build draws about 530W at peak (320W GPU + 120W CPU + system). A 1000W unit runs it at ~53% load. Absolute minimum: 650W.
| GPU RTX 4080 / 4080 Super | 320W |
| CPU Ryzen 7 7800X3D | 120W |
| Motherboard + RAM + drives + fans Rest of system | 90W |
| Total peak draw | 530W |
⚡ The RTX 4080 uses a 12V-2x6 (12VHPWR) connector — choose an ATX 3.1 PSU with a native cable.
→ Adjust for your exact buildRecommended power supplies
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FAQ
Is a 650W PSU enough for an RTX 4080?
It's the bare minimum, but we'd recommend 1000W. This build peaks around 530W, and a 1000W 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 RTX 4080?
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.
Does the RTX 4080 need a 12VHPWR cable?
Yes — get an ATX 3.0/3.1 PSU with a native 12V-2x6 connector rather than using the pigtail adapter that ships with the card.