Mark Fox over at Warp2Search has posted some information on Detonator 41.80 driver "Hidden" options using coolbits+ patch. Using this registry hack, you will gain access to options not usually made available by nVidia including enabling or disabling Fast Writes and Sideband Addressing.
The screenshots below show some of the options that the coolbits+.reg will enable for you. That's just apart from all the usual functions enabled via the famous "coolbits" setting ;). You can download the coolbits+ file HERE. (Note, only tested on Windows XP)More information @ Warp2Search