Use eXtreme Power Supply Calculator to calculate Power Supply Wattage

[HappyAndyK]

The eXtreme Power Supply Calculator contains 1300+ CPUs including latest processors from Intel and AMD, latest graphics cards from NVIDIA, AMD and more!

The recommended total Power Supply Wattage gives you a general idea on what to look for BUT it is NOT a crucial factor in power supply selection! Total Amperage Available on the +12V Rail(s) is the most important, followed by the +5V amperage and then the +3.3V amperage.

eXtreme Power Supply Calculator

[Shantanu]

oh ! this is cool. Asus used to offer a online tool for calculating the recommended power supply. This really does help.