Definitely Corsair 750TX,twice larger fan/quiter noise level,plus 4x6+2 pins,I myself is running one with my i7 overclocked to 3.8Ghz and a GTX 260 c216 overclocked,been having problem even starting a game with the Hec 750W before,once I swapped it out for this Corsair 750TX,everything has been...