Huh? Current is supplied throughout the system. It is not "gated" anywhere. There is no harware on/off switch for each part If the PSU fails to provide adequate system power.......awful and really negative thingy's start to happen. You need to do a little electronics basic study....buy the book, "Bebop to the Boolean Boogie", By Clive Maxfield; Hightech publishing. I'm serious, you will be way ahead of the game wiht information on basic digital and analogue circuit theory.
Noli Nothis Permittere Te Terere!!
EVGA 680i, Dual EVGA 8800GT'S (650/950), 4 gigs OCZ DDR2 1066, Intel Q9450 at 3.8 Ghz, Koolance Water Cooled, Dual Plextor16x DL DVD+/-RW. Dual WD 250gb 16mb Cache Sata 3.0. 3DMark06 score = 19,168.