PSU Calculator for Graphics Cards

Work out the power supply wattage your graphics card and CPU need, with safe headroom – or check which GPUs your existing PSU can run.

Graphics card (GPU)

Using ASUS TUF Gaming GeForce RTX 5090 OC Edition 32GB GDDR7 (reference board power). Pick another GPU to change it.

Processor

SSDs / hard disks Case fans

Power supply you already have (W, optional)

Recommended power supply

1050 W

Graphics card575 W
Processor105 W
Board, RAM, drives, fans103 W

Estimated peak draw 783 W, plus 30% headroom for power spikes and ageing, rounded up to the next 50 W.

The card’s brand recommends at least 1000 W.

An estimate, not a guarantee. Quality matters as much as wattage: pick a reputable 80 PLUS unit, and for cards with a 16-pin connector an ATX 3.x supply with a native cable.

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