NVIDIA GeForce GTX 660 Rev. 2 's Advantages
Released 10 months late
Lower TDP (140W vs 250W)
NVIDIA GeForce GTX 760 X2 's Advantages
Boost Clock has increased by 4% (1072MHz vs 1032MHz)
Larger VRAM bandwidth (192.3GB/s vs 144.2GB/s)
192 additional rendering cores