2 BTC bounty - why can't I get lower Mem clocks?

[yochdog]

Using the beta allowed me to lower the clock. 

So who deserves the bounty?  I will honor the wishes of the forum! 

The latest beta?  If so, it looks like you would have got it done regardless (you suggested "the beta" before anyone else did) 

I thought so too, but I did not want to be seen as suggesting that!

[1714066881]

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[1714066881]

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[1714066881]

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[Elmojo]

I seem to be missing something here.
The several posts above mine appear to suggest that the issue has been resolved.
Has it? Not for me.
I still can't drop my mem clocks below the AMD default of Core Clock - 150mV.
Has this been resolved and I missed it?

[P4man]

So how does it impact performance? AFAIK, you need SDK 2.6 for radeon 7 cards, and with SDK 2.6, hashrate scales pretty good with mem speed (IOW, if you lower your mem speed, hashrates take a nosedive).
Am I wrong?

[wachtwoord]

Using the beta allowed me to lower the clock. 

So who deserves the bounty?  I will honor the wishes of the forum! 

Very simple question and only you can decide: Did any of the specific info posted help you reach the answer (did you already know it or not). If it didn't help no bounty, if it did bounty.

[Elmojo]

afterburner (beta 14) will let you lower it to 685.  Real value as shown using GPU-Z sensors tab.

Then start your cgminer with -gpu-memclock 685

I'm running cgminer at 1200/685, see my signature for details.

Not with the latest AMD drivers it doesn't.
Version 8.96 (Feb 14) pretty much breaks AB completely.
In fact, i had to uninstall it to get my card to even run a stock clocks.
Hopefully Unwinder will fix it soon, but it's in AMD's lap now.

[Elmojo]

Here is my driver's info:
Driver Version   8.921.0.0   

That's the old driver version I was talking about.
With the new driver (8.96), it breaks AB, even Beta 14.

[Elmojo]

My bad, I thought I had the latest version.

No problem, this whole thing confuses the heck out of me!
I'm debating rolling back to an earlier driver, but I'll probably wait at least until I get my water block installed later this week.

[jake262144]

I've installed 8.95.0.0 driver, the pre-certified catalyst
http://support.amd.com/us/kbarticles/Pages/AMDCatalystSoftwareSuiteVersion122PreCertified.aspx
Driver Packaging Version   8.95-120214a-133662E-ATI

AB (beta14) cannot change the values in the BIOS, but I run cgminer with bin from run on older driver and
I can run 1177/685.  I cannot change the memory clock but I can run it @ 685

So the hack is to downgrade, run cgminer, upgrade, re-run cgminer with its bin from previous run.

That's good info, thanks.
AMD is doing everything they can to drag users through mud...

[GenTarkin]

Try using ati tray tools as well. I dont know if it supports the 79xx series yet but, I used it to lower the memclock on my 6950 to 150mhz (confirmed via gpuz) where all other tools failed to set it this far down.