No body said it was going to be cheapbut yeah we need a solution like the never released msi gus 2
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Exactly that. Currently the cheapest option is to get the 7750m (though you lose nvidia optimus) + the mlogic mlink or the owc one, or the sonnet echo express SE, they can all fit that card in there and its a mobile and clean solution, that should be around 300
However if you want more power, you can always go for the cube and go for a 670 or 660ti, that should be around 800
there is a clear power difference, but I dont know if its actually worth it
there was a review on toms
http://www.tomshardware.com/reviews/pci-express-graphics-thunderbolt,3263-7.html
that showed a mid range gpu maintaining almost equal performance to a top of the line one.
Again why dont you just go with the cube and keep your old gpu, or just you know sell everything and go for the combo that i mentioned, if you want to keep in the nvidia camp you can go with the 640 for a clean clutter free solution
as a plus you should have better power than the 650m and the 8870m
And im in the camp of those who are waiting for a more interesting solution in terms of bandwidth, thunderbolt 2.0 should be released in the next year or so, hopefully with broadwell, so I can hook up my would be rmbp 13 with something good that can enjoy the bandwidth.
Nando knows much more about thunderbolt than I do. So you can ask him when thunderbolt 2.0 is coming.