I have a FireGL v3600 under Vista x64. I want to overclock it. I've tried ATT and Rivatuner 2.08. Any suggestions or tweaks to enable clock manipulation? FYI it is being used for F@H.

Power Strip pretends to change the clocks, but they are not reflected in AOD, and there is no noticeable difference in fps.  
 
gpu 600->660 (the 3600 has the same core as the 5600. The 5600 is factory at 800...was expecting better.)
mem 500->550

ATiTool and Riva Tuner should have worked. What drivers are you using?

Thank you for the reply. The driver lists as 8.440.0.0 It is the latest download from ATI's web site. I think Perhaps its x64 Vista giving me the trouble?  
 
When I try to ATiTool (on boot) it says the low level driver failed and to try to run it from the short cut. After doing so it says the driver is already installed, but not started...clicking the start button doesn't change anything.
Rivatuner 2.09 should be released in a few hours...I'll try that soon.  
Any other ideas?

I never got Riva or ATItool to work, but AMDGPUclocktool did! Although it is a bit rough (it claims clocks failed, but they don't as verified by itself, GPU-Z and AOD). I went from 600 to 760 on the core and from 500 to 610 on the memory. Stable in Crysis, SC, and F@H.