I'm having trouble getting past the 600-650mhz range with both my miners.
When I try to go any faster they start mining fine, then they reset with a "no valid hashes for over x secs" message (x = 6-7 or so).
Of course the time of the reset reduces the average hash rate to lower than I would get at 600-650 (420-460GH/s).

I'm running cgminer 4.3.4 on Minepeon 0.2.6, my options are as Gateway suggested:  --hfa-fan 100 --hfa-temp-target 0 --hfa-temp-overheat 110 --hfa-fail-drop 0 --hfa-hash-clock <number> .
My temps are ranging from the high 80's to the low 90's depending upon clock.

Anyone have any ideas?

BTW, Congrats to the Peppermining Team. NICE job! 

Is there any air running over the back of the board? The VRMs themselves require some cooling over long sessions if there's not a lot of air around the board.

Pictures incoming.

I've got my Habanero hooked up to a Corsair H110 cooler. Currently I have the stock fans from Corsair on it. It looks like this:

I'm mining w/ cgminer 4.3.3 running on OSX. My cgminer args are as follows:

cgminer.exe -o http://site:port -u <user> -p <pass> --hfa-fan 100 --hfa-temp-target 0 --hfa-temp-overheat 110 --hfa-fail-drop 0 --hfa-hash-clock 400 --api-listen --api-network

When I bring up the pepper mining app and look at dies, I'm seeing this:



Any suggestions? I've applied Antec Thermal Grease to the chips and torqed down the cooler.

For most people, you won't use them. They're the same M3 thread as an Intel heatsink, so you might be able to use the included hardware if it fits. If the hardware that came with the heatsink doesn't fit though, those screws can be used to hold down the cooler head.

FWIW I had almost the same problem -- ASIC 0 & 2 were 10-15 degrees hotter than 1 & 3. I tried tightening the screws on those corners and it had no effect on temperature at all.

I hesitated to take the water block off and reseat it because I had been very careful when I applied the grease the first time, it was evenly applied, no bubbles, etc -- but eventually that's what I did, and it's like a different machine, just 4 degrees of difference now. All I did was take the water block off, clean off the old grease, and reapply new grease. Somehow it just worked out better the second time.