yea its just some 650 watt power supply i was gonna build my own pc but i had extra money lying around so i just got it premade but im pretty sure i would have to upgrade my power supply. im gonna look into the 3070s though since i think that requires less power least i think so.
A good 650 watt would probably be O.K for a 3080 as long as you didnt have a lot of peripherals. PSU calculator here.
As I said anyway I'd probably save the money and get a 3070 at 1080p though, and if youre not 100% on your PSU a 3070 definitely uses less power.