It's a feature, to reduce heat, noise and power used. If you are not doing anything, you don't need your CPU at full speed. If you give your CPU some work (Prime95 or Orthos) you should see it jump to the expected speed. Intel CPUs are quad pumped, so 200 MHz FSB causes CPU to run at 4x200 = 800.
If you searched the board you would find your question is asked on a regular basis.