NVIDIA's GeForce GTX 660 Ti continues to impress. Performance scaling was good, with the SLI configuration scoring about 20-50% better on lower settings and at the resolution of 1920 x 1200 pixels, and between 80% and 105% better with higher settings and at 2560 x 1600, compared to the single-card setup. As expected, the GTX 660 Ti was much better than AMD's Radeon HD 7870 2-way CrossfireX configuration, averaging between 20-30% better on most tests.
Against the higher-tier GTX 670 SLI, the GTX 660 Ti SLI trailed by about 5-10%, which mirrored its single card performance. Surprisingly, it also competed with AMD's flagship Radeon HD 7970 in 2-way CrossfireX configuration, with only about 3-5% difference between them in many benchmarks.