CPUs you can use with a 700W PSU

Assuming you already have a ~300W GPU, here's a compiled list of possible CPUs you can use:

CPU	TDP	Quick Buy
AMD Ryzen 7 9800X3D	120W
AMD Ryzen 7 5700X	65W

What CPUs can you use with a 700W power supply?

First of all we have to make an assumption regarding the rest of your PC, let's start by assuming you have a ~300W GPU. Also, we can assume that the rest of your PC components (MB, RAM, Fans, Storage, etc...) consume an additional 100W, and we'll have an additional 100W of margin. That leaves us with 130W for the CPU.

With 130W you can squeeze in CPUs such as AMD Ryzen 7 9800X3D, AMD Ryzen 7 5700X.