How much power the GeForce RTX 3050 needs
The GeForce RTX 3050 is rated at 130 W. With Ryzen 5 5600 the whole PC comes to about 308 W under load, so a 450 W power supply gives about 40 percent headroom and a 450 W unit is the least we would use. Across the four processors in the table the recommended size runs from 450 W to 650 W, which shows how much the processor matters.
For comparison with the neighbouring cards in our list, the GeForce GTX 1070 (150 W) needs 550 W and the GeForce RTX 2060 (160 W) needs 550 W with the same processor.