If your 2013-model Mac Pro is having video issues, Apple may be ready to fix the problem for free. The company has a new hardware repair program in place to deal with the issue, but you'll have to ask because it isn't being advertised.
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tl;dr version: Mac Pros made between February 8th and April 11th last year are covered by the free parts replacement program. If you're having weird video issues, schedule a Genius Bar appointment.