I have Windows 7
16 GB RAM
64 Bit system
with AMD Radeon HD 8500 Graphics Card
I find it really disheartening that I have to be a computer programmer to use these products. Is Adobe in on some deal with NVIDIA?
And I honestly don't even know what a CUDA is or if I can use it with Radeon.
No, you do not need an Nvidia GPU to use After Effects.
There is only one feature that gets an extra boost from an Nvidia card, and it is not a vital feature.
See this page for details: