I have a Geforce4 ti 4400 . And I'm using rivatuner and softquadro4 to mod it into quadro4 750 XGL. I's a very usefull utility and now I can use quadro functionnalities.
Try this here. It's free.
http://www.nvworld.ru/downloads/rivatuner.zip
http://www.nvworld.ru/downloads/SQ4ScriptPack.zip
Everything is explain here:
http://www.nvworld.ru/docs/sq4e.html