Building a cheap gaming PC? Help

The Corsair Builder CX 500 is a good basic PSU for a single card. I recommend upgrading - for $10 more you can get an excellent Antec 750w PSU now on sale for $70AR:

Antec High Current Gamer Series HCG-750 750W ATX12V v2.3 / EPS12V v2.91 SLI Certified CrossFire Certified 80 PLUS BRONZE Certified Active PFC Power Supply

http://www.newegg.com/Product/Product.aspx?Item=N82E16817371049

It will easily handle two cards like the ones you are looking at.
 
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