[kbutler]

If you're serious enough about your gaming hardware that you're currently building gaming PCs every couple of years, you're still going to be replacing your CPU and your graphics card every couple of years, whether graphics are inside the case or not.

Besides, Thunderbolt = 10 G_b_ps, PCIe x 16 = 8 G_B_ps. No idea on latency/transfers per second, though. (http://www.intel.com/technology/io/thunderbolt/index.htm, http://en.wikipedia.org/wiki/PCI_Express)