I am using a 550w PSU, Cheap-o, but good. I think its called RSG series or something like that. Anyways, i am using XFX 5750, Q6600, 2 internal HDD's, One is Seagate 500GB and the other one is WD 500GB and i also have an external HDD by WD 500GB which is hook up to my USB 3.0 PCIE card, and i have a keyboard and mouse and using a Logitech Dual Controller. Was wondering , can my PSU handle this? Am i ok? Everything seems to be working good, temps are good on every device. I have 4 fans in my computer btw.