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#21
Run Heaven with everything set to max and run Mark 3d with the standard performance settings. I have an evga 670 and will compare scores with you.
Also, use EVGA Precision x and set a custom fan profile. The 600 serise will begin to throttle a little at 70C, so make sure to stay below that. And if you are playing older games, you probably won't see a lot of difference but some of the newer more demanding games you should.