AMD Radeon RX 560 's Advantages
Boost Clock has increased by 19% (1275MHz vs 1071MHz)
More VRAM (4GB vs 2GB)
Larger VRAM bandwidth (112.0GB/s vs 96.00GB/s)
384 additional rendering cores
AMD Radeon RX 550X 640SP 's Advantages
Released 1 years late
Lower TDP (60W vs 75W)