Every other mac has a fixed graphics card, so Apple can route data and video through Thunderbolt as it pleases. In the Mac Pro, will thunderbolt ports be via an special apple custom "Thunderbolt" PCIe graphics card? It think the new Mac Pros will have something like a AMD Radeon HD 6970M as part of the motherboard so that Apple can have thunderbolt ports on both the front and back of the machine. This would leave the traditional graphics PCI slot open for other/additional cards. I don't think apple would release a machine that could have thunderbolt disabled by the user swapping out a graphics card. Am I missing something here?