[Moved to Hardware forum.]
From what I understand OSX does not really support that with most GPU acceleration applications. I would not recommend it.
thanks for your answer.
As far as I know, the INTERNAL CPU to GPU data transfer speed is way faster than the speed you can obtain via thunderbolt, so it doesn't matter what GPU you put in an external thunderbolt case, you won't benefit on any speed increase.
But still when I goggle this subject I find people saying that they edit and render much faster with an external thunderbolt case and GPU.
So I thought about trying to find the "truth" here on this forum.
Anyone else wants to share his/her experience?
By spec TB doesnt have near the PCI-E bandwidth for a 16X video card especially one of the new PCi-E 3.0 video cards. So no matter what there will be less performance than in a desktop system. The overall problem would be latency which will cause GPU acceleration to crash if it gets to high. I would not suggest trying this since by design the card is already out of spec.