Moving to After Effects forum.
The only native effect that runs on the GPU would be the ray-traced 3d renderer. Other than that, the only thing the GPU is useful for (in the current version of AE) is a few third-party plugins (like Element).
Does AE recognize the Quadro?
First of all thank for answering !
It seems that AE recognize the Quadro because I can use GPU accelration, and GPUSniffer.exe show me the Quadro.
The Tesla K20 is not a card that the current version of After Effects will use for the GPU acceleration of the ray-traced 3D renderer. Any page that told you otherwise was misinforming you.
See this page for details of GPU features in After Effects: