I'm not asking if it's better/more convenient to have one card as opposed to sli/crossfire/dualGPUcards. I just want to know which has more raw power in this case? Both would be working with 3GB vram obviously. I have one 280 at the moment and plan to add another soon inexpensively, whereas upgrading to a 780ti or 980 on release would cost me my wife's arm and leg ^__^