[...]- about downclocking the memory - mine are at 450MHz, but that's only because at lower MHz sometimes the driver crashes and also it seems to affect the hashing speed. [...]
Hashing with 7970, cgminer + MSI Afterburner I undercloked memory to the amount of 50-100 Mhz with core clock around 1140. I didn't see the impact on hashing power or driver crushes but GPU's fans speed and tempratures.
i have my 6xxx cards memory at 275, i can go lower, below 200, but i do seem to lose hash rate, and higher only affects the temp. I kill ccc, and combine trixx with cgminer and get fan speeds between 1% and 50% with target temp at 70 but usually lower. i must be a lucky one!
Are you sure that MEM is running at that speed? I'm asking because I get report that change was successfully but when I look at MEM speed I see that it is running at 1100. And this happens at every speed below 900 or 1000... Even in afterburner... I can set it but when I look I see 1100 in graphs... Or it could be the driver...
Lucko
I went through all this on my 6870's
So in MSIAB I could only drop mem to 100 below GPU Engine speed (840)
So I uninstalled CCC (Catalyst control Centre) left driver and runtimes
So I could then drop mem to 550 in MSIAB.
Saved that as profile 1 drops mem to 550,
then profile 2 drops it further to 330 (Only if Profile 1 applied and I close and re-open MSIAB)
I then apply profile 2 to drop men to 330
-> On start up apply Profile 1 550
Close and re-open MSIAB and apply Profile 2 330
(Don't set to apply on startup - As you'll be booting in safe mode a lot until you find your "sweet spot"