Hi, I am planning to use 2 different power supplies for my pc. Actually, I am already running 2 psu (600W Quality 80% = mobo,pcx,cpu)+(Cheapo 300W=HDDs,rom,fan) at the moment. Now, I want to take it further. I wonder if i could take out the cheap 300W psu and replace it with another good quality 500W 80% certified psu to power up the HDDs,pcx and rom. My main concern is the graphic card. It requires 2x 6 pin power. Since it is already drawing some power from the motherboard with certain amp, could it be a problem if i use 2x 6pin external power from another psu with different amp? Currently 600W psu is not sufficient since the overclocked fx8350 4.6Ghz would draw at least 280W and the pcx would draw 300W on full load. Buying 1000W PSU is out of question, even getting a highend 800W psu will cost a fortune to me.