my friend was telling me about upgrading his gpu...he currently has a gigabyte hd 6670 ddr3...but he has this Powerman psu(400w, 80+ certified), bottom mounted fan, a switch and a power connector at the back....its in inwin PE689...
his other specs are_
1 stick 4gb ram
so can this psu run a hd 7850 or gtx 660??