Interactive tool

PSU Sizing Calculator for a Mining PC

Pick the right power supply wattage for your CPU + GPU mining rig. Adds component draws, applies headroom, and checks the PSU sweet spot.

Components

CPU TDP (watts)

Check your CPU model on the manufacturer site. Ryzen 7 / Intel i7 = ~105W typical.

GPUs Watts each

Use sustained mining draw, not the manufacturer peak. RTX 3060 ≈ 170W, RTX 3070 ≈ 220W, RX 6700 XT ≈ 230W.

Other components (W)

Motherboard + RAM + fans + drives + risers. 60W is a sensible default.

Headroom & efficiency

Headroom (%)

Current: 30%. Mining is sustained, not bursty - 30% is a reasonable floor.

Efficiency target

Component draw

365 W

CPU + GPUs + other

With headroom

475 W

+ 30%

Recommended PSU

550 W

80 Plus Gold (~87% at 50% load)

PSU sweet spot

At the recommended size, this build draws roughly 66.4% of the PSU's rated capacity. That's inside the 40-70% sweet spot - the PSU runs at peak efficiency, fans stay quiet, and it lasts longer.

Skip no-name "1200W" PSUs from marketplaces - they lie about output. Stick to known brands (Corsair, Seasonic, EVGA, Be Quiet, FSP).