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#11
Any i3 would be fine match for that GPU and even much better one. Most of the games dwell at 1 or 2 cores anyway and i3 is good at single threaded applications.
Something like i3 4330 for instance: Intel Coreâ„¢ i3-4330 Processor (4M Cache, 3.50 GHz) Specifications
Two real cores but will act as 4 in most applications because of 4 threads.