The reason I want to SLI 460's is because their performance is very similar to one single gtx 580, yet they are $200 cheaper.
But yeah you think I could do what I mentioned above? Run sli'd 460's and a standalone 260?
Man, simply you can use 2 monitors whether you SLI or not, so no need for the 3rd card.
I know, the problem is when you go fullscreen in a game on one monitor, the other one blacks out. That is a major turn off to me because I use that second monitor be it, vent, walk throughs, build orders, etc, while I play. What I am trying to do is bypass the second monitor going black when you are running SLI.
Can I add a 3rd graphics card in my 2-way SLI enabled PC to connect more monitors?
Yes, you can add an additional graphics card to your PC to connect two additional monitors. The additional graphics card must have a GPU that is different from your SLI GPUs and must be NVIDIA PhysX capable (GeForce 8 series and higher with at least 256MB of memory). For example, two GeForce GTX 2XX GPUs in SLI and a GeForce 9XXX GT is a supported configuration.