Core2 T5500 not Speedstepping

I have an MPC Transport T2400 with a Core2 Duo T5500 1.66 Ghz

When I open up Rightmark, CPU-Z, or any other tool, I see my CPU cores at 1.0 GHz (166Mhz FSB at 6X multiplier) no matter if the CPUs are under heavy load or not.
Speedstep is enabled in my bios.

I know my Maximal FID is 10X because Rightmark is telling me that, and that would place me at 1.66 Ghz, where I want to be.
But I never achieve 1.66 Ghz at any time, even when I am running under constant heavy load.
I just flashed my BIOS with the most recent update, and no luck.
Any help would be great!