'Using an External GPU via Thunderbolt on a MacBook Pro ( If you're also using a Thunderbolt cased PCIe video card, send a report to news at ) Original Article from 2015 follows, with a 2012 MacBook Pro using older OS X version. Update: On March 29th, Apple released macOS 10.13.4 which includes eGPU support for some Macs/TB3 cases/graphics cards.
( Troubleshooting & external power supply notes at bottom) Using a Thunderbolt Video Card with a MacBook Pro (Late 2012)
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