New
#11
450W actually, you quoted the Crossfire recommendation.
I do agree that his power supply is on the weak side, and if the specs for it listed here,
POWER SUPPLY - HIGH PERFORMANCE
I'm surprised it runs at all. According to that it only has 14A on the 12V rail; might be enough (barely) for when the card is at idle, but put a load on it and things will start to act up fast.