That really depends.
What games you are running, what HZ your monitor is.
If you (lets say) have skyrim modded to the fullest with ENB, detailed grass mod, mesh, texture quality mod etc..
it won't be overkill at all, but it WILL be beautiful :lol: :lol: :lol:
If you are planning on playing The Sims, then yes that is overkill.
EDIT: If you are a normal person buying a top of the line graphics card, you will presumably use it for a couple of generations so it will be (the ugly, hated word) "futureproofing".