Dolby Digital 5.1

I need to buy a PSU for my new PC build and my budget is fairly strict right now. I want to spend under $80 for a 750 watt PSU (possibly watercooling it in the future) http://pcpartpicker.com/list/7Z63HN that's what I am building right now. I know that CPU prices won't go down that much for...

Please help. I've upgraded my PC from 2x2gb ddr 2 ram to 2x4gb ddr3 and my CPU from a dual core to a Am3+ quad core processor. Soon as I start up a game the PC shuts down completely where as before it played games ok. I upgraded as wanted to play the high spec games. Please can you help. The PC...