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Another thing worth checking out is the upcoming amd Trinity chips, they promise powerful igpu's with more cpu muscle than the current Llano, whilst having lower tdp's.
You could kill two birds with a single shot with those.
It's not enough. That's 180w max on the 12v rail. It's apparently an older PSU, because it's providing a lot of its wattage on the 5V rail. That was common in older PCs, but newer stuff sources primarily from the 12v rail, meaning that 400w figure you ballparked is going to have to come almost entirely from 12v. You're short by more than a little bit with that PSU.It does 15A on the 3.3 and 12, any of you guys have anything to comment on that?
I think you're going to have a really hard time doing this build with a powerful, or even mid-range, discrete card. It can be done in some mITX cases, but those builds have good ventilation and an ATX PSU.