I currently have a 3dfusion 7800 gt that does not have vivo. I will be adding another 7800gt for a sli setup very soon to run in sli mode. My question is can I add another 7800gt that has vivo (aka bfg) use it in the 1 st slot and move the non vivo to the 2nd slot and vivo work off of the main card. Or do bothe cards have to be vivo in order for it to work. Thanks