The power supply should be at least 1200W, offering the power to six graphics cards, motherboard, CPU, memory, and other components.
Do you need a good CPU for mining rig?
CPU — Described as the brain of the computer, this is often considered to be the most critical component, but for the purpose of mining, GPUs do a better job, so we tend to get a CPU, which does the bare minimum, as we are not depending on it as much as the GPU.