Go to BIOS, and disable Intel Speedstep.
Disable the C1E in the BIOS.
You could just leave it enabled in BIOS.
Then simply go into Power Schemes (like lcandy says) and select 'Always On' to easily disable the Cool & Quiet temporarily.
Note: You will not get proper results with Conroe and CPU-Z 1.35 - you will require at least CPU-Z 1.36.