What is the highest clock rate that has been achieved? I find anything above 900MHz causes the hash rate to drop in half even when my temperatures are below 80C. I may be power limited or can I play with the voltages somehow?
You need to up the voltage. I've hashed as high as 735-740 GH/s at 962Mhz, with high hw errors and bouncing off the 104 mark.
I'm getting a pretty solid 700-710gh/s at 925-950.
Damn. I am at 900-970 right now and getting 677 GH/s. Hash rate dips at 925-970 and I can see temp drops in the app. Temps are at 99 on both cards with my current settings. Oh well, no complaints here other than my OCD wanting to get 700 GH/s.