After the initial "wow this looks slightly better" you won't even notice the difference.

With those specs... 7 is the golden number.. I've got similar specs with a 680. I had it set to 9, but experienced atleast 1 crash a play through. I think on a vanilla game you might get away with it, but the graphics enhancers and mods just mean it becomes unstable.

I'm a massive graphics [censored] and hate things 'popping' into existence, 7 is absolutely fine with me.