you probably have C1E and EIST enabled in bios so it causes your cpu to downclock itself when its idling/doing nothing.

i have my 2140 @ 2.66ghz right now had to bump vcore up a notch due to vdroop so its really running at default volts now, 1.325v. i know she has more to go but for now i'm happy with it. i'll try 400*8 tomorrow for 3.2ghz.