Needing a DisplayPort or Active DisplayPort adapter is for AMD cards not Nvidia. But with Nvidia until the GTX 6xx cards you could NOT run more than 2 monitors from a single card. You have to have 2 Nvidia cards all the up to and including the GTX 5xx cards.
So in order to run 3 monitors at one time on a 9500GT you would need two cards. Not to say you can't have 3 devices plugged into it but only 2 can be active at one time unless you have 2 cards.