I am looking to upgrade my computer and ran across this 128MB BFG Ageia Physx Physics Rendering Video Card DDR3 PCI BFGRPHYSX128P. now a physics card is good for having a video card, or not having a video card. I have a zotac 9800gt at 512 mb ddr3 pci-e that supports physics from agia but was told a way back a phisics card is good to have but forgot why. should I get this pci card to run with my video card? or is it a waste of 35 dollars?