The only times when AE will use the GPU massively is when using the Raytrace 3D stuff or plug-ins extensively use OpenGL or CUDA. Otherwise AE still is primarily CPU-based.
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Myelnium is correct. See this for details of how the GPU us used in After Effects:
See this page for information about hardware for After Effects: http://adobe.ly/pRYOuk
Also there is no such thing as Mercury Engine in AE. AFAIK only Premiere, Photoshop and Lightroom use this.
'Mercury' is just a sloppy marketing name for the performance improvements in Premiere Pro in CS5 and later.
See this for details:
Thanks, guys, glad to know there´s nothing wrong.
I guess I thought the "Mercury" name referred to the settings used when the dedicated video card GPU was enabled.