I have a newer built machine with a set of 9800 GTX's and it has a BFG Physx dedicated card installed in it... do i still need that card, will it help with the 9800's, or is it just wasting a space in my box?
It's a waste. The two GTX's have more than enough shading power to spare. Even using just a handful of shaders for physx will have tons more processing power than the old ageia cards.
Not really useful from what I have heard.... but.. if you want you can send it to me and I can do some testing against a G92 based 8800 or 9800 which I am in the process of buying.
Edit: just picked up a 8800GTS 512... just in case you are interested in a little testing that I will do for "free"... hehe.