What PSU do you need for an RTX 3070?
The RTX 3070 draws up to about 240W 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 3070 paired with a Ryzen 5 5600 / 5600X; if your parts differ, the calculator gives your exact number in seconds.
Paired with a Ryzen 5 5600 / 5600X, this build draws about 406W at peak (240W GPU + 76W CPU + system). A 750W unit runs it at ~54% load. Absolute minimum: 500W.
| GPU RTX 3070 / 3070 Ti | 240W |
| CPU Ryzen 5 5600 / 5600X | 76W |
| Motherboard + RAM + drives + fans Rest of system | 90W |
| Total peak draw | 406W |
Recommended power supplies
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FAQ
Is a 500W PSU enough for an RTX 3070?
It's the bare minimum, but we'd recommend 750W. This build peaks around 406W, 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 3070?
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.