I have a 2013 Mac Pro. The current gfx card is an AMD FirePro D700 6GB. I have been having issues with AE crashing if I am playing thru a composition with very many effects. I hope that upgrading the gfx card will solve this issue and am wondering if I am able to put in a Radion Pro Vega 56 8GB card. Is this possible on this machine or do I need to go with a different card or is this not even the issue?