Please tell me if i can ply minecraft on 400 fps as i am buying a new pc. And can i play far cry 3 on mid settings with 50+ fps?
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Your graphics card is not the best for gaming to be honest, what i would do is change your CPU to an i5-3570K which is just as good for gaming and get a better graphics card, maybe a GTX 660 or 7870, they will run games great at 1080p.
Four Hundred frames per second? Why on earth would you need that?
Agreed, downgrade the CPU and upgrade the GPU. Don't play at 400Fps, because a standard 60hz monitor will still only show you 60fps (you should enable vsync to prevent over-rendering and reduce the heat burden on your hardware).