A GTX 580 requires a lot of amps.
Your links do not work but as far as the PSU is concerned you can accurately determine what PSU power is required in watts and amps. on the 12v rail from the link below. It's straight forward and easy so no guessing is required. It will also show you how to determine which model PSUs are quality PSUs that can deliver the necessary power for your PC.http://www.tomshardware.com/forum/314712-28-please-read-determine-power-required