What exact version of AE do you have (down to the decimal points)?
What sort of problems are you experiencing? AE uses the GPU for very little as this post describes: GPU (CUDA, OpenGL) features in After Effects
Without proper system info and an explanation of what issues you actually have this is not really a useful post. For all we know whatever issues you have could not at all be related to your card or OpenGL for that matter and getting a new card may not resolve anything.