Well, that would explain why it was designed this way. In my reading i know i saw somewhere you can add a third card. I found it on Tom's
"The Z77A-GD65's most surprising feature, perhaps, is a pair of tiny two-lane PCIe 3.0 switches between its second x16-length slot and its clock battery. While all of today’s boards automatically switch from single-slot x16 to dual-slot x8/x8 modes for CrossFire and SLI, the Z77A-GD65 can further switch to x8/x4/x4 transfers for three-way graphics arrays. This causes quite a bit of commotion amongst some of MSI’s competitors, but keep in mind that third-gen PCIe x4 slots offers the same bandwidth as second-gen PCIe x8 slots. That should be enough for three-way CrossFire, so long as your hardware (CPU and GPUs) are PCIe 3.0-compliant."
And a few paragraphs down..
"We doubt that MSI could ever get an official thumbs-up from Nvidia for its x8/x4/x4 design, so the inclusion of a two-way SLI bridge is acceptable. Three-way CrossFireX is possible using the bridges included with two of the cards, and MSI’s inclusion of four SATA cables is adequate, if not generous."
So i will have to go with AMD if i want 3 way. I see you dont need to connect all cards together for it to work like you do with SLI. I am really wanting the CUDA option though in case I get heavier into things like audio/video rendering, Photoshop, and the like. I guess I will live with just two cards for now so i can have my front panel back without modifying the connectors.