Check into this article for a way that's proven to work on a Macbook Air, via Thunderbolt. It currently only works in Bootcamp (Windows), but there's no reason to think it can't be made to work in OSX natively.
For an investment of about $250, you can see gains of between 5-7 TIMES the FPS of the Air's built-in GPU.
ATM, it's messy, both in terms of exposed wiring, and in configuring trial and error, but it works.
http://www.tested.com/tech/456971-what-it-takes-connect-external-gpu-macbook-thunerbolt/
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Further, Sonnet is offering a thunderbolt 2 GPU enclosure:
http://www.sonnettech.com/product/thunderbolt/
Of the featured units, this one seems to be the best option for performance (supporting full-length GPUs, with internal cooling built-in), but it is just under $1000!!
http://www.sonnettech.com/product/echoexpressiii.html
For an investment of about $250, you can see gains of between 5-7 TIMES the FPS of the Air's built-in GPU.
ATM, it's messy, both in terms of exposed wiring, and in configuring trial and error, but it works.
http://www.tested.com/tech/456971-what-it-takes-connect-external-gpu-macbook-thunerbolt/
____________________
ETA:
Further, Sonnet is offering a thunderbolt 2 GPU enclosure:
http://www.sonnettech.com/product/thunderbolt/
Of the featured units, this one seems to be the best option for performance (supporting full-length GPUs, with internal cooling built-in), but it is just under $1000!!
http://www.sonnettech.com/product/echoexpressiii.html
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