Just learnt a tweak to control the idle temps, heard it's toasty on the stock units.
If you make a profile in catalyst after turning on Overdrive( make sure clock and memory settings are correct). You can then go to the file "C:\Users\your computer name\AppData\Local\ATI\ACE\your computer name. XML. the xml file will have the same name as the catalyst profile you saved. right click and hit edit.
<Feature name="FanSpeedAlgorithm_0">
<Property name="FanSpeedAlgorithm" value="Manual" />
</Feature>
<Feature name="FanSpeedRPMTarget_0">
<Property name="Want" value="0" />
</Feature>
<Feature name="FanSpeedPercentTarget_0">
<Property name="Want" value="65" />
Change the value to "manual" and Want value to "65" (% of fan speed)
Save the file then reload your profile in catalyst.
For fellow XP'ers it's under C:\Documents and Settings\"your computer name"\Local Settings\Application Data\ATI\ACE\Profiles.xml
Knocked 10 degrees off idle and 5 off load on here.