Graphics Card could use an upgrade, but believe it or not, you have exactly what Rockstar reccomends.
CPU needs an upgrade. This is what I personally have, it's also what Rockstar recommends you have...
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Your RAM is also what is recommended. I personally have 16GB DDR3, but I doubt you'll see much of a difference.
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Performance wise, your Hard Drive Storage Space and OS don't really matter.
You should be good with that info, if you have anymore questions feel free to ask!