I've only got 340MH/s what's your mining rate?
Running two 5770s at about 200 MH/s each and a CPU at about 4 MH/s.
Just discovered bitcoin-miner (under Windoze) will run my CPU at 13.8 MH/s.
This weekend I'm going to see if I can run my GPUs under Winderz with out reducing their hash rate.