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#21
Do you have Speedstep enabled?
With it enabled it should downclock to 1600mhz, if not then you may need to check the other power saving states in the bios or even check the power plan in windows control panel.
Once its downclocking to 1600mhz you need to go into the bios and adjust the voltage offset to get what you want for the load voltage, its a little trial and error, but if you already know the stable Vcore required for the speed you want then your will just need to adjust it accordingly. Have a look round for tutorials on offset mode.
Paul.