Originally Posted by mikemelo1369
Try not to compare to prebuilt computers as a lot of people basically overkilling their system. 1k PSU are almost never needed. If you're going to get a higher end video card or if you want to crossfire I would recommend something like a 700-800W unit.
Actually pre-builts almost always put the bare minumum psu, and very cheap psus too.
1000W psus are becoming mnore common due to the high end gpus, gtx 47080s and 5980s sucking lots of power.
To the OP, 550ish or more will do, there are a few psu calculators out there that are actually accurate.
The other factor is psus last for a while... couple builds if you don't get stupidly crazy, so running a bit higher, and good quality, is a sound investment.