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 ASRock RX 7900 XTX GDDR6 24 GB AMD Radeon Chipset 384 bit 2680 MHz Graphics Card (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

750 W

Graphics card355 W
Processor105 W
Board, RAM, drives, fans103 W

Estimated peak draw 563 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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