I just bought a antec 550 truepower 2.0 and have a ASUS P4C800-E MB 478 875P, I know it what the 20 pn connector is for however I am confused about the 4pin atx 12v connector. What is the 4 pin for and am I supposed to hook both the 20 pin and 4pin up a the same time(I am guessing by the location one powers the cPU and the other the reat of the components) Hoe does the dual 12v benefit my MB, I can not continue assembly until I know , please help.