The new Enermax NAXN ADV 650W power supply features a single 12V rail. It is rated for 50A of 600W of power. Both the 3.3V and 5V rails are rated for 20A each with maximum combined output of 120W. The 5VSB rail is rated for 2.5A or 12.5W, which is a bit lower than we are used to seeing, but should still be okay. Maximum combined output for the power supply is 650W.
Enermax NAXN ADV 650-Watt 80 PLUS Bronze Power Supply Review