I stumbled upon a weird occurence. My HD7950 is clocking some 630MHash/second, but in the stats of the pool it reports more than 710MHa/s on AVERAGE. I believe this is due to the WU being >9.5 compared to 8.8 before the cooling mod.
What is your WU (work utility) and MHa/s on SHA-256? (Bitcoin and such)
I have currently: HD7950, 630MHa/s avg. (long term), WU=9.5 (long term avg.)