NVIDIA GeForce GTX 660 Rev. 2 's Advantages
Boost Clock1032MHz
More VRAM (2GB vs 1GB)
Larger VRAM bandwidth (144.2GB/s vs 24.00GB/s)
576 additional rendering cores
AMD Radeon 540 's Advantages
Released 2 years and 7 months late
Lower TDP (50W vs 140W)