same thing with the vcore, sometimes its the value I picked, then on another boot its back at "Auto"! What a board.
Make sure that both the C1E and Intel SpeedStep options are disabled if you want to set Vcore manually else it will revert back to Auto ie. they are linked options.

I wonder why this is so on this mobo cos they are independent options on my P5B Dlx and Commando boards.