Hi I have Acer desktop. It has core i3 processor. It is sufficient for me. There is 512 MB graphic on board. But now these days I have interested to play the graphic games. So its 512mb graphic is not enough to my all new HD games. Now I want to buy new NVIDIA GTX450/460 and AMD GPU 6850/6870. I am confused between both graphic cards. Please guide me which Graphic card is best for my computer.
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