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Finally got up to 2 gh/s woo! Can't get my 4th 5970 to connect though. 
Sure you power supply can handle that? I have a 7970 + 7990 (2x7970) and adding a 3rd card destabilizes the system. And that's with a 1200w PS.
I am mining on four cards with a 1500W power supply, but mdbssm is right, check to make sure how much you need per card and try to double it.
