I've been tracking down why my one box crashes, and it seems to be that if the miners go idle (not looking for the 'mine at two pools' suggestion here..) they must automatically down clock (and up clock the mem) themselves to the lower level settings, and then back up to the mining clocks once the work comes in. I'm thinking that the clocks bouncing around pisses it off and then locks her up. AMDOverdrive control goes part of the way, but with the 11.6 drivers can't (or doesn't?) clock it outside of the stock clocks, which aticonfig can.
So after some googling and reading through aticonfig docs, I can't see how to set the other sets of clocks. I would like to set all the clocks to the same, over/under clocked timings so that it doesn't switch around ..