Okay, with Intel systems, the FSB is "quad-pumped", meaning the FSB's total speed is 4 times faster than the system clock (or FSB at 200MHz). I'm not sure exactly how that works, I'm no expert on the new Intel setups.
The fact that your FSB isn't running at 100% full speed is nothing to be worried about, it's due to slight imperfections in the manufacturing processes for the motherboard circuitry and the quarts crystal that generates the clock frequency that controls al communication in your PC.
My FSB for instance runs (usually) at 201.4MHz, instead of at 200. Nothing to worry about, realy. If anything, your PC sounds like it's running perfectly!