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Any powerful PC has two brains, in the form of a CPU and a GPU.
The stand out GPU at the moment in the Nvidia Geforce GTX 660. This card offers you the latest GPU technology for about $250, and can churn out well over 30 frames per second for any modern game title that you care to throw at it.
Of all the Nvidia GTX 660 cards out there, the Gigabyte GV-N660OC-2GD stands out head and shoulders above the rest in terms of performance and reliability.