I recently bought one, to tide me over 'till the new cards drop (alot) in price.
But I want to know what card that Nvidia has does it compare to?
Exactly which X1900 did you buy? The X1900GT, XT, XTX? Crossfire is ATI's dual GPU solution and you'd have to own two X1900s to use it. Two X1950XTXs are almost as fast as a stock 8800GTX in some cases.