What PSU do you need for an RTX 4070?
The RTX 4070 draws up to about 200W 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 4070 paired with a Ryzen 5 7600 / 7600X; if your parts differ, the calculator gives your exact number in seconds.
Paired with a Ryzen 5 7600 / 7600X, this build draws about 395W at peak (200W GPU + 105W CPU + system). A 750W unit runs it at ~53% load. Absolute minimum: 500W.
| GPU RTX 4070 | 200W |
| CPU Ryzen 5 7600 / 7600X | 105W |
| Motherboard + RAM + drives + fans Rest of system | 90W |
| Total peak draw | 395W |
Recommended power supplies
GamerKit may earn a commission from links on this page — at no extra cost to you. We only list gear we'd actually recommend for the spec. As an Amazon Associate, GamerKit earns from qualifying purchases.
FAQ
Is a 500W PSU enough for an RTX 4070?
It's the bare minimum, but we'd recommend 750W. This build peaks around 395W, and a 750W 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 4070?
80+ Gold. It's the best balance of price and efficiency for a build this size. Never pair a good GPU with a cheap unrated PSU.