Replacing a power supply

taintedmeat77

Honorable
Feb 3, 2014
1
0
10,510
Hello, I bought a pc this summer (I know, i should have built it, but i was busy.) It came with a gt 620 installed in it. I want to upgrade it, but at the time i bought it i did not realize that it only had a 350 w power supply. I am going to upgrade to a gtx 660. So my question is, what power supply should i go with? Modular vs not modular? what brand is best? what wattage? and if you could give me detailed instructions about how to do it it would be much appreciated.