Power supply for the GeForce RTX 4090

How much power the GeForce RTX 4090 needs

The GeForce RTX 4090 is rated at 450 W. With Ryzen 5 5600 the whole PC comes to about 628 W under load, so a 1000 W power supply gives about 40 percent headroom and a 750 W unit is the least we would use. Across the four processors in the table the recommended size runs from 1000 W to 1200 W, which shows how much the processor matters.

For comparison with the neighbouring cards in our list, the GeForce RTX 5080 (360 W) needs 850 W and the GeForce RTX 5090 (575 W) needs 1200 W with the same processor.

Processor by processor

For the GeForce RTX 4090, with the Ryzen 5 5600 the load is about 628 W and a 1000 W supply fits; with the Ryzen 5 7600 the load is about 628 W and a 1000 W supply fits; with the Core i5-14600K the load is about 763 W and a 1200 W supply fits; with the Ryzen 7 7800X3D the load is about 694 W and a 1000 W supply fits. The gap between the lightest and the heaviest build is 200 W of recommended supply, which is about the rating of a mid-range graphics card on its own.