Your video card requires:
500W (or greater) power supply with one 75W 6-pin PCI Express power connector recommended
600W power supply (or greater) with two 75W 6-pin PCI Express power connectors recommended for AMD CrossFire™ technology.
I'd get the 600W. You may need more for a later upgrade. The card itself uses about 200W, the rest is used by the other pc components.
Your video card requires:
500W (or greater) power supply with one 75W 6-pin PCI Express power connector recommended
600W power supply (or greater) with two 75W 6-pin PCI Express power connectors recommended for AMD CrossFire™ technology.
I'd get the 600W. You may need more for a later upgrade. The card itself uses about 200W, the rest is used by the other pc components.