Oh how the mighty have fallen! That card was once the mightiest around, drooled over by gamers the world over and now it has been tossed aside, like an errant Autumn leaf.
So E-bay it!
Is this new card AGP or PCI-E? If you want an Nvidia AGP it's going to be a downgrade from the X850!:http://www.tomshardware.co.uk/radeon-geforce-graphics,review-31583-6.html