thanx for your reply but that is not what I understand in the above link,
it seems related to the ray traced engine which is only for 3D extrusion I believe :
Optional: Graphics card from list below with at least 1GB VRAM and CUDA 5.0 for GPU acceleration of ray-traced 3D renderer
This is not my concern here & it doesnt really answer my question :
does AE "see" my GPU as it should for OpenGL /OpenCL and why is the shader model option grey out ?
PS : I totally understand that my GPU is really not optimum for a sofware like AE, but as I said before I have to understand what's going on here.
Nothing is wrong.
The reason that the shader model value shows up as blank is that it simply isn't checked for on Mac OS. Note that on this page about GPU details for After Effects, the shader model is only mentioned in the context of Windows:
Not should to understand,
does this mean if I were on Windows with the same setup,
I will get the same low performance or it would be a little better ?