Processor FSB Query

I am running Vista Home Premium on a Core2 Duo E6400 running at 2.13ghz. My
bios tells me that the processor is running at 2176Mhz which when halved is
1088Mhz, roughly the 1066FSB for the processor.

Vista reports in Computer properties the correct processor and speed but
reports the FSB as 800Mhz. I have checked the power settings and these seem
ok. My understanding is that if the FSB is lower then surely the clock speed
would have gone down as well.

I am using an Abit AB9 Pro on the latest Bios Revision.

I can't think why this is happening.

Any help appreciated...