I just got the 880G to replace an old Biostar that burned out and ive been playing with the overclock... and while running prime95 and Video game benchmarks, the HTT clock bounces around between 160MHz and 215MHz.. In the BIOS, the HTT clock (reference clock is what i think it says in the BIOS) is set to 215. what would cause this?

i have Cool-n-Quiet, C1E Support and Thermal Throttling disabled.

specs:
880G Extreme3
Phenom II x3 740 @ 3762MHz (17.5 x 215MHz)
x2 2GB A-Data DDR3-1600 @1720