Hi!
I have bought a ASUS R9-280. I have a Zumax 500 watt PSU.
http://www.newegg.com/Product/Product.aspx?Item=N82E16817101011
My PSU has 2 12v rails rated @20amps each. I've read the 280 need 30 amps to the 12 volt rail. I've seen I can use the molex adapters to use each rail for the same...