See this page for the official system requirements.
After Effects doesn't use the GPU for a whole heck of a lot, but that card should work for what it does use it for (some third-party plugins render exclusively on the GPU, so this would be good for, say, Element or Red Giant Universe).
16 GB of RAM is on the small end of things. It's acceptable, but I would want 32 or more.
That processor is a pretty good choice.
What hard drives do you have? It's usually recommended to have a separate SSD used exclusively for AE's cache.
If this is a computer you already have, you can download the trial and test it out on your machine to see if it works for you.
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