Dude I hav 4 hard drives so I need a 5 sata thingee for my psu the 500w and the 550w hav only 4 sata things so I can't go for corsair ill just go for cooler master . Should I go for a 500w or a 550w ? The sapphire amd/ati radeon 7770 HD overclocked edition needs 500w so should I get 500w cooler master psu?