Too Long; Didn't Read
During this month’s <a href="http://www.techmeme.com/170404/p5#a170404p5" target="_blank">briefing on the Mac Pro</a>, Apple said, paraphrasing, that they tried to put a <em>TITAN X</em> in the 2013 Mac Pro, but it was too hot and caused the CPU to throttle. That was my interpretation at least.