Underclocking GPU Memory

[Eaks77]

Hey Everyone,

I know this topic has come up in the past, So I appologize.  For the record... I have read most posts and it seems it doesn't help or it's outdated.

I'm currently running a Rig with two 5970's and one 5770.  The 5970's are crossfired and the 5770 is just with a dummy DVI plug.  I'm using GUIminer and MSI Afterburner.  I'm trying to underclock the memory to 300mhz.  I've read this can reduce the heat by a substantial amount.  I could really use a couple degree's drop.  I've tried altering the .CFG file with no success.  It usually results in a freeze and then forced reboot.  I'm running Windows 7 XP and i've only been able to alter the .CFG file when in SafeMode.

Is there another way or program that could underclock the memory?

Thanks

[2Kool4Skewl]

Use linux and cgminer w/ Catalyst 13.1, AMD APP SDK 2.7, AMD ADL 5.0 installed.  That allowed me to adjust my voltages on my 5770s.

[BookLover]

Assuming your using windows get Catalyst Conctrol Center (CCC).