Question.

[Sakumo]

Won't do, even for Sakumo's card (manufacturer page says 400w).

You'd need to buy another PSU to be safe (you could hook it up, but you'd risk frying your PSU).

Bah, I listened to the manufacturer's power minimum for my card and it said 500W, some people ran it on a 400W Corsair AND a quad. I could have ran my computer fine on a 550W from Corsair, but I had to listen to EVGA's power listing, also, they usually test on an intensive system and that's usually the amount to cover it.