I'm browsing for information on GPU expansion via Thunderbolt, and I found this PCIe expansion chassis from OWC. I'm curious if this could take a graphics card, and if it could, I'm wondering how it would work and what the capabilities of it are... I'm not even sure if it would work, but if it does take graphics cards, wouldn't I need to download the GPU drivers? Wondering how I would switch between the integrated and the Thunderbolt expansion GPU? If everything works, would a powerful GPU really increase performance that much (over Intel HD 5000)?