I wasnt ripping on your psu, just saying what mine was, since its not in my sig.
I now have four hard drives inmy tower. they each draw 25w when being accessed, but currently two drive are used as storage, so they shouldnt be accessed when playing a game, since the os and programs are on one single hard drive.
My two optical drives arent being used either, aswell as my tvtuner card, so yeah I have a lot of hardware, it isnt all being used when gaming. So I doubt its a lack of power.
How do I go about uninstalling steam? Just in add/remove programs? Will that get all the game files?