I took a 650 out and put an 850 in mine, same make as yours for both, but mine is a 3080 OC but I never tried it with the 650. Corsair are as your lad says is up there with the best power supplies.
Nvidia recommend a 600 power supply for the card, see
https://www.techpowerup.com/forums/t...supply.275443/
so the one you have should be ok, but it does depend on what it’s powering, ie lots of items.