How to check how much Power your Computer needs?
Info - Power Supply Tester
How to choose the best PC power supply
How to know how big of a power supply (for PC) you need - Quora
Ham Shack Power Supplies - How many amps do I need? - W0DHZ - Dale Henninger
How To Upgrade and Install a New Power Supply for Your PC
What power supply is right for you? Check out EVGA power meter
Choosing a Power Supply - aspectLED
Dave Erickson Power Supply Load PS-Load Project