There is quite a lot of information out there on how to hack pc nvidia cards -

but its not quite in one place - and i never tried this myself:

http://www.insanelymac.com/forum/ind...owtopic=228733
http://forum.voodooprojects.org/inde...pic,842.0.html
http://www.mvktech.net/component/opt...d,59274/#59274