Hi, I have bought the new mac pro with 2XAMD FirePro D700 6144 MB AND 8 core xeon cpu.
Now when in render with Premiere pro all ok, it uses GPU while if I use After Effects there is a message on screen like this attached.
(It means that i don't use GPU when exporting right?)
Pls help me to understand.
The message means exactly what it says. It is telling you that for one specific feature---the ray-traced 3D renderer---the CPU will be used instead of the GPU, because you don't have a GPU that can accelerate this feature.
This does not matter.
The ray-traced 3D renderer is an obsolete feature that you do not need to concern yourself with. There are many batter ways to use 3D in After Effects, including using Cinema 4D, which now comes with After Effects:
Details about GPU usage in After Effects are here: