I'm sure you need to set your BIOS to the correct CPU speed.
But since you didn't give too many details on your CPU besides it's overall clock speed I can't really help you.
It always has it's multiplier and it's base frequency...as an example
200MHz x 14 = 2.8GHz
if yours was set to 133 instead of 200 that'd result in
133MHz x 14 = 1.8GHz
not saying those are the exact numbers, but I'm just pointing out chances are it's a setting within the BIOS that needs changing