I'd like to get the 750tx, but have one primary conern, the the 750 has a lot of noise in the 12v line comapred tot he the 650, but im not sure if it'll impact performace at all. efficiency is important too. 5 case fans, clarkdale overclocked, corsair h50, 2 hard disks, either radeon 5770, 5750, or 9800 gtx. the price fidd is only about 15$$ CAN, which make the 750 even more tmeping. any ideas.?