My GTX 570 came with two 6 pin-to-molex connectors.
My 750W HX Corsair PSU however came package with two 6pin-to-6pin connectors.
Would it matter if I used those instead of the Molex connectors the Graphics Card came with? Would it make any difference whatsoever?
Also, the 6 pin-molex connectors the GTX 570 came with have 6pin on one side (to plug into the card), and then two molex connectors coming out the other end. If I used the 6pin-molex connectors would I have plug all 4 of the molex connectors or just one molex from each 6pin-to-molex connector?
The two 6 pin-to-molex connectors are supplied just in case your power supply does not have two 6 pin connectors itself. Since your power supply did come with the two 6-pin connectors, you do not need to use the molex adapters.