A:AnswerI would say no increase the power supply. Not gonna hurt much if you up it to 650 watts. Nvidia recommends using 550w for the gpu so food for thought.
A:AnswerIt comes with a Ryzen 5600 CPU. You can pull the CPU out of this machine if you wanted to. Issue is gonna be the bios. Idk if they locked this down to only support the 5600g.
I didn't mess around in the bios. Mine came with a huge scratch down the side of the case. The motherboard also doesn't have a video out port, very generic minimal feature motherboard