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 GIGABYTE Arc A380 GV-IA380WF2OC-6GD 6GB (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

400 W

Graphics card75 W
Processor105 W
Board, RAM, drives, fans103 W

Estimated peak draw 283 W, plus 30% headroom for power spikes and ageing, rounded up to the next 50 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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