Probably never? The point of an X2 card is to go above and beyond single-card performance. With the heat and other limitations of the X2 design, you won't see many 9600GX2 cards beating the 9800GTX IMO, which would be a waste of time for NVidia. GX2 cards have always been designed to be the top-dog and a 9600GX2 just wouldn't be it.