Adding an external GPU to your Mac is probably a better upgrade option than getting a new one | TechCrunch
Apple Macbook Pro 13 (Mid-2012) - i7-3520M · Intel HD Graphics 4000 (споделена памет) · 13.3”, HD (1280 x 800), TN · 256GB SSD · 16GB DDR3, 1600MHz · Mac OS X | LaptopMedia.com
MacBook Pro 15" with Retina Display Running 3 External Displays