Benchmarks: Just Cause 2, Max Payne 3
When running Just Cause 2's benchmark at 1920x1200, the GTX 660 was capable of 51fps, 9% slower than the GTX 660 Ti, 6% faster than the HD 7870 and 25% faster than the HD 7850.
The GTX 660 averaged 48fps when testing with Max Payne 3 at 1920x1200, 2% slower than the Radeon HD 7850 and 16% slower than the 7870. Gigabyte's overclocked managed to produce another 3fps.