I'm considering an upgrade for my 3-screen rig, and 2-way TITAN looks very appealing. It would be hooked up to my Z68 mobo which is PCI-E 2.0, in a 2 x 8 lane configuration. Would this be a limiting factor? I'm guessing not because people are running 3-way TITAN in reviews in a 3 x 8x configuration (albeit PCI-E 3.0). I don't currently consider the bus bandwidth to be limiting with the 680 SLI, those GPUs are working as hard as they can without any restrictions. What do you guys think?