It seems a bug with 10.7 drivers,because now that i checked mine,i idle at 400/900 whereas it should be 157/300,even changing it from the profiles didn't help! If it stays like this i revert back to 10.5, which showed correct 2D clocks.
EDIT,i decided to log-off after i made my changes, and when i logged in again, the clocks were correct(157/300).So make a new profile and edit it, here is how in case you don't know it
1_Open CCC and choose Overdrive tab,unlock the settings
2_Go top options,profile and choose profile manager.
3_In the composition tab,choose "The following settings" and in the "ATI Radeon HD 5800 series"make sure only ATI overdrive is checked.
Then enter a profile name,then save and close it(Do not activate).
4_Go to C:\Users\Your UserName\AppData\Local\ATI\ACE\Profiles (Its hidden so make sure you unlock hidden files and folders)
5_Open the profile with wordpad and do this edits:
<Property name="Want_0" value="15700" />
I once ran into this problem, after messing with the default profile. I ended up having to remove the drivers, do a complete clean sweap of ATI drivers, while in safe mode, then reinstalled in safe mode. After all that, it started to perform correctly again.
I'm using two monitors, so my default idle should be 400-1000 instead of 157/300 anyways.
I tried your suggestion and my idle is still 400-900, and refuses to go to full speed in GPU load applications.
It's weird, nowhere in my profile application does it list memory at 900MHz - it all states memory should be at 1000MHz (since I have two monitors). Yet my memory in GPUZ just shows up as 900MHz.
Right,i forgot you had 2 displays and your card should run @ 400/1000.
Well try installing older drivers like 10.6/10.5 or 10.4 and see if it helps(try to do a clean install of 10.7 first though)
I have the same problem on CCC from 10.4 to 10.7. The clock on GPU is 500Mhz and on memory - 600Mhz. Its in idle 2d mode, and my videocard (5850 asus) is heating up to the 60*C! Its not comforatble to let PC running 24/7 with this temps
I tried using profiles in CCC but this method doesnt work too. I spent 3 days trying to make my card runnig 157/300 re-installing different CCCs, but nothing helps
p.s. My card was in service center for a month (had some problems with noisy cooler). Maybe some "evil genius" flashed my card with other BIOS... I know, that sounds silly, but i dont know now what prevents my videocard downclocking to 157/300 in idle mode. Maybe it is bios (or the wrong angle of the Moon )? I have BIOS Version 012.011.000.006 with BIOS Date 2009/09/25
hmm,never had issues with FF but something similar happened to me.When i sometimes open Photoshop my VGA goes to 400/900,and doesn't come back to 157/300 even if i quit PS,i have to log-off/reset and it goes back to normal.