So I thought I'd make it easy for everyone to try the latest cgminer 3.3.0 and overclock settings all rolled into one, so here is a firmware with the overclock settings settable from the web interface:
I have tried it and I am back to FW 20130519 which was the most stable for me
first I had this
(perhaps my mistake was that I have kept settings)
and then
this was with only 282 Mhz
with 300 and 325 cgminer runs only a few minutes, the fans went up to 38xx rpm (noisy) and then cgminer restarts
thx for your work
PS: I have learned again -> never change a running system