wol-va-rine
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ATI recommends at least a 600W power supply for an HD 5770 Crossfire setup.
we all know about "recommendations", you can run a crossfire 4850 setup with a good 500w psu, figure the odds you can't with a 5770 setup...
They usually over shoot with the recommendations, just for people with junk PSU's. I would still go with at least a 450 watt though. That's still pushing it IMO.
I'm seriously getting one of those. I was going to buy another 5770 when I got the money, but now I think I'm definitely getting one of those PSU's if my video card can still hold up decently... that's just flat out awesome. I wonder if they make a modular one...
if you're talking about the X650 (or X750), they are modular...