Hi
I'm using MSI Afterburner to tweak my 2x6950 set up. I've used it to underclock my memory to 625Mhz...However, the MSI hardware monitor shows that the clock jumps back up to 1250 once I start mining. When idle, it shows the mem speed at 150Mhz (presumably the GPU is in energy saving mode). I know that Afterburner is doing something when I tweak my cards to 625Mhz since GPU-Z shows the change.
I've also tried Saphire Trixx, but that utility appears to be a bit buggy with my dual gpu setup.
Those that are underclocking your memory: does MSI's hardware monitor show your memory speed jump up when under load too? Anyone know how to keep mem speeds low while under load...or am I doing something wrong?
Sometimes when I mess with the clocks in Afterburner on 58xx cards it does the same thing.
While the miner is working I:
1. Change the core clock up a little but up and the memory clock a little bit down
2. Click Settings, select a different GPU. Wait for the "GPU# Selected" to go away
3. Click Settings, go back to the trouble GPU. Wait for the "GPU# Selected" to go away
4. Clock up/down to the desired amount.
I'll go to like 600 or 700 memory, then I'll switch, come back, and go to 305.
This seems to do the trick. If I don't do this it just keeps switching back like what happens to you.
You can also try changing it in smaller increments and letting it run for a little bit each time you switch the speeds.
For a while my cards were real fussy about their memory being underclocked, then one day they all decided to play nice.
If this is a dedicated miner you should check out LinuxCoin:
http://forum.bitcoin.org/?topic=7374.0Follow this guide if you want to put it on a USB drive:
http://forum.bitcoin.org/index.php?topic=7374.msg286940#msg286940
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