What PSU do you need for an RX 580?
The RX 580 draws up to about 185W 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 580 paired with a Ryzen 5 2600; if your parts differ, the calculator gives your exact number in seconds.
Paired with a Ryzen 5 2600, this build draws about 355W at peak (185W GPU + 80W CPU + system). A 650W unit runs it at ~55% load. Absolute minimum: 450W.
| GPU RX 580 / 590 | 185W |
| CPU Ryzen 5 2600 | 80W |
| Motherboard + RAM + drives + fans Rest of system | 90W |
| Total peak draw | 355W |
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 450W PSU enough for an RX 580?
It's the bare minimum, but we'd recommend 650W. This build peaks around 355W, and a 650W 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 580?
80+ Bronze or 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.