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Would an Antec 650w TruePower Trio PSU have enough juice to handle 2 4890 cards in crossfire and a q9550 overclocked?
Crossfire is something else, you add another 190 Watts. I recommend a PSU of, at the very least, 750-800 Watts. Make sure you have some reserves folks. It's not that your PC will consume that much power, it's just that you want to make sure your PSU can deal with the hefty load and will stay stable during your entire gaming experience.