I put them at 250 and they mine at 470ish, put them at 243 and they mine at 492.
But after a few weeks I stare at them and think, why dont I try 250 again! so I try it and bam 470ish, then I put them back to 243 and they sit at 480 until I start stop cgminer a few times then they go back to 492.
Maybe I should try restarting cgminer with them at 250... in a few weeks...
That's not bad. I've got 2 stuck at 440GH and won't go above 218.5 without killing it's hashes.
Do you get X's? if so did you try and redo the thermal paste on the chips? Arctic MX-4 non conductive is what I used on the upgrade kits which all run at 500 easy.
I'm not going to both repasting these 2 as its only 20gh/s loss
They're from an early batch so I wasn't too worried about it since they weren't guaranteed above that anyway. I do get X's if I overclock them though, just 1 or 2 usually.