I have been using EVGA GT 640 for past 7 months in my computer. Now I want to upgrade the graphic card by adding EVGA GT 670 along with my existing graphic card to get more accurate PhysX effect. Actually I had doubt that since I am using two graphic cards that are different from each other that are from same series, will it create any problem for working of the games? Can someone shed some light on this problem?
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