Soldato
Reporting from the graphics forum.
I just got my lovely Inno3D GeForce GTX 780Ti iChill DHS Today and got the high idle clocks when using 144hz (I also had this with AMD but the jump wasn't as big)
Anyway I have a work around for this. Select 120hz in the Nvidia control panel and use that for normal 2d use. Then in the Nvidia control panel make a profile for your games (Global may work but I like to use profiles) and set the fresh rate to "highest available"
Now your 2d hz will be 120 and 3d (gaming) will be 144.