I’m running a TR1MP (uk spec 900mhz cpu).
If you have the “Power Panel” go into “power profile” and choose the “edit/create profile”. a new window opens now choose on the left the option you use when running on batteries, (so for me it’s “maximum battery” with some edits).
Now in the right hand window choose “CPU control” in “System” and change to “adaptive”
close the windows (or make other changes) and it will ask if you want to save the profile say yes.
It should now be at 595mhz unless it requres more grunt and will automatically step up if required.
You can see it working by downloading WCPUCLK from here:-
http://www.myplc.com/sony/amd_powernow_dashboard.htm
Works for me let me know how you get on… oh and if you really want to see an improvement in performance with TR series have a read of my replies in the SSD HDD topic