So I set up two 5870's (not crossfired - one powers each monitor) yesterday. Everything was hunky dory yesterday, both of them at 100% activity and at around 75 celcius.

Today, I wake up and they've both lowered themselves to about 80-85% activity according to the catalyst control center and are at around 68 to 70 celcius. Whaaaaat?

How do I fix this? My 5870's are both delivering about 250 Mhash/s instead of the 300+ that I was expecting. I want that extra 100 Mhash/s!

Any ideas?