I currently have 2 780 Ti running SLI, but want to upgrade my cards to the 980 Ti. Can anyone give me an insight to the performance of the 980 Ti vs the 2 780 Tis I'm currently running? I'm just wondering what impact I'll see on my performance if I decide to swap both of my 780 Tis for 1 980 Ti now, and then add a second 980 Ti later. From what I understand, the 980 Tis are faster and have more memory, but would my performance drop if I buy 1 980 Ti for the time being. Any ideas how these cards compare? Thanks.