I also underclock my ram to 310mhz - running on server 2008 r2 sp1
Which utility do you use to get your RAM that low? Is there a way to allow it to be done from within cgminer?
I just use MSI After burner (beta).
I have catalysts overclocking disabled.
The only problem is that MSI Afterburner does not keep the settings after a reboot.
Anyways, I run AB as admin, set the maximum clock speed and then drop the memory down to 600 or 620 depending on the card.
Hit apply, and do it to all of the cards (I mix 7950 and 7870s). Then I exit
Reload AB and then I drop it again to 300 or 310.
Hit apply, then exit (or leave it running, but I jsut exit it).
My settings are:
-Enable hardware control and monitoring
-Enable low level hardware access interface - set to user mode
-Disable ULPS
-Unofficial overclocking mode without powerplay support
I don't change the voltage on the board, as I haven't needed to as yet (and if I ever need to - I just wont overclock that high)
I don't bother with start with windows etc - as it doesn't remember the settings anyways when unofficial overclocking mode is enabled.
That means that my ram speed always starts at default (although cg can drop it by 150). I then have to load up AB and set it to 300/310.
However I can RDP or tight vnc to it from work or from my phone, and its stable enough that it barely resets. I have caught it blue screening and forcing a reset twice though, and once I had to ring up and get my wife to do a physical reset when its TCPIP stack appeared to have died (couldn't RDP or VNC in, or PSEXEC to it, yet it was still mining)
To get unofficial overclocking mode running, I had to change an ini file. After that happened, and the EULA popped up, and closed and reopened, I then closed it again and did a reboot. After that it came good - except that it now no longer stores settings/profiles.