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It'll depend on what you want to do with it.
General PC use, you won't notice a single bit of different.
Watching movies, still won't.
Playing games... Old games, you MIGHT notice a difference in frames per second. New games will show more of a difference when the graphics settings are equal.
Comparisons of that are really hard to find online because test sites don't like to keep hardware/software around for testing newer components. It's one thing that's always annoyed me. They always mix in newer motherboards, faster RAM and/or hard drives, better processors, different games...
Anywho, here's two links I found which actually have the same game and close hardware except for the graphics cards.
http://www.techpowerup.com/reviews/N...GTX_680/9.html
http://www.techpowerup.com/reviews/N...GTX_980/9.html
Personally, I haven't bought a "top-three tier" graphics card in a decade and don't regret it. I'm not up for paying 2-3 X's the price for a %15-20 increase in FPS. I run at 1920x1200 and if I get more than 60FPS I'm happy.