How much power the Radeon RX 9070 XT needs
The Radeon RX 9070 XT is rated at 304 W. With Ryzen 5 5600 the whole PC comes to about 482 W under load, so a 750 W power supply gives about 40 percent headroom and a 650 W unit is the least we would use. Across the four processors in the table the recommended size runs from 750 W to 1000 W, which shows how much the processor matters.
For comparison with the neighbouring cards in our list, the GeForce RTX 4070 Ti Super (285 W) needs 650 W and the GeForce RTX 5070 Ti (300 W) needs 750 W with the same processor.