Hello everybody,i have readed a lot of threads about this but im still confused, i have a thermaltake toughpower xt 575w 48a on 12v,this psu is good enough for an gtx 580 or an hd 6970 i also have a i5 750 oced 3.6, 4GB DDR3, 1TB hdd. This is my first post and thank for the help and sorry for my bad english .