I have updated my mac pro from 4.1 8 core to 5.1 12 core. I installed 64 gig of memory and i bought a second hand 680 gtx. Everything works so far only i have some serieus after effects problems. After effects is really slow and i always get this message... The GPU-accelaerated ray-traced 3d renderer does not have enough free video memory (VRAM) to operate. The ray-traced 3d renderer will use the CPU bla bla bla. So i know there is an issue with the graphic card... I didn't flash it because i don't need the boot screen. But can someone tell me how i can fix my graphic card.. Or is it broken, is there a program what can help me... Please help me because i can't work this way in after effects... Previews and interface delays are killing me!