Hi all. Running 3 6990s overclocked. Initially all 6 cores start mining at around 400 mhash but after a few min the total hash rate drops to about 1800. Some run about 350 others below 250. If i kill one of the miners the others the pick up the slack of the killed miner to get back to the same hash rate.

Anyone running into this? Ive tried all sorts of ovrrclocking and aggression settings. What info can i provide that would be useful for advice?
Using aticonfig and amdoverdrivectrl with phoenix.