Yeah, I "hear" that is the big concern now.
If you play any of the new games you have to cool your vid card and the vid card should get it's own power plug.
Meaning. The hard drives/vid card use the most power when they need and it changes depending.
I tend to use one line of plugs for the hard drives and another for fans/vid card. My two plug line (SATA) is for my hard drives only. Three plug line has my fans and video card.
If you wanted to play your games and have a quiet computer I would recommend liquid cooling. Also, Antec just put out a case that is insulated and just plain awesome. Check it out.
Let us know,
Your Hardware Guide.