NVIDIA GeForce GTX 660 Rev. 2 's Advantages
Larger VRAM bandwidth (144.2GB/s vs 96.00GB/s)
448 additional rendering cores
AMD Radeon RX 550 512SP 's Advantages
Released 3 years and 1 months late
Boost Clock has increased by 4% (1071MHz vs 1032MHz)
Lower TDP (50W vs 140W)