I have a GA-M59sli-s5 MB, Gigabyte GV-NX73T256p-RH Video card, AMD Athlon 64 X2 4600 AM2 The MB has a ATX_12V_X2 power connect - and an ATX 24P Powerconnect. What is the difference between these 2 powerconnects. Is one "better" than another? I also have a 4 pin powerconnect on the MB labeled PCIE_12V - do I need this powerconnect for the video card I have? Thanks