well my friends old gateway, really really old, 1.4 ghz celeron 128 mb ram....
anyway, i replaced his psu cuz his friend and it worked just find.. i used a POS coolmax 450 watt 19 amp.. nothing bad happened, in fact, he even sold the computer for 100 bucks to his friend
Intel 3770k @ 4.4 GHZ | Galaxy GTX 770 SLi | 16 GB G.Skill Sniper | ASrock z77 Extreme4
2xSamung 840pro 128GB in Raid | 2x1TB Seagate | Antec 750 Watt GamerSeries
Intel Core i3 3220 | Galaxy GTX 650 | 8 GB Corsair Vengeance | ASrock B75M | Samsung 840 120GB