i am probably the wrong person to ask, i used a cheap (within recommended specs) psu some years back with dire results. i now respect what the psu does and the damage it can cause. i think you're just within spec but it's a risk i wouldn't take. i think (not sure) that the old 320meg 8800gts and 640 meg had the same min specs, or were similar. i cant see ram being too greedy.