New
#11
I'm just quoting Sapphire.
500W seems excessive, as the card can't draw more than 150W if it stays within the PCI-E specs (75W through the slot, 75 more for the 6 pin PCI-E connector). However, it may cover poor 500W PSUs; you may be able to get away with less if the supply is any good (adequate current on the +12V rail). 300W seems a little dicey, though.