Oldtimer,
glad to hear your OC settings "stick". My "current clock settings" are still dropping down to 500 core 750 mem... but I'm going to DL GPU-Z as it seems that this may actually not be the case. In any case I'm not sure why CCC works for you but not for me in this regard?!?
If your problem is heat, I've definitely found the solution: the card's fan is set at a low default setting (23% in my case) which gave me very high heat (in the 75 C range at idle!!)- Follow these instructions to increase your fan speed and be AMAZED as you watch your temps drop 30 or more degrees:
Instead of saying ""C:\Documents and Settings\Your Windows ID\" for XP or "C:\Users\Your Windows ID" for Vista, use the %USERPROFILE% variable, which every Windows system will have. It is the same for both Vista and XP, and points to the appropriate location.
I've changed your wording a bit to make it easier for n00bs to do/understand. Not taking credit for this, as that belongs to you.
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Make a profile in catalyst after turning on Overdrive and make sure clock and memory settings are correct. Then edit the .XML, where = the name you saved the CCC profile under. The file will be located in the following folder; to get to it, click START, then RUN, then copy the following path and paste it to the RUN dialog box, then hit ENTER:
Vista: %USERPROFILE%\AppData\Local\ATI\ACE\
XP: %USERPROFILE%\Local Settings\Application Data\ATI\ACE\
Right-mouse click on the .XML file and click edit. If prompted for what program to open the file with, choose Notepad.
Now go down the page until you see the following lines in the XML file ...
Change the "Property name="FanSpeedAlgorithm" value=" from "Automatic" to "Manual"
Then change "Property name="Want" value=" from "23" to your desired fan speed.
Save the file then reload the Profile you just edited in the CCC.
Remember that your fan will be locked to the % you set; if it's set too low you could damage your card. Be careful overclocking and setting fan speeds.
For Crossfire, be sure to set the lines in the .xml file for all cards.
I got it from this thread:
http://forums.guru3d.com/showthread.php?t=265745&page=4
I've got mine "passed" up to 700 core and 1165 mem !!! making it all the more frustrating that CCC appears not to let me stick the OC.