Reading this threadhttp://forums.tweaktown.com/f69/i7-920-ex58-ud4p-tmonitor-reporting-2400mhz-35468/
I'd say download CPU-Z and prime95, and open CPU-Z and watch the multiplier of 12, and see if it increases, or watch the mhz and see if it increases when you turn on prime95.
Doesn't have to be prime95... maybe just memtest, or any program that requires alot of processing
Apparently Tmonitor can be inaccurate
Please reply with results