I heard it's not that huge difference. It is basically the same but is capable of SLi. Not sure if it was the 9800GTS or 9800GX2 though. Might research on that. I think you should keep your card, or if you want, get a new XFX 780i Mobo and another 8800GTS 512 for SLi. (Not even sure if that would work or not lol.)