AMD Radeon R9 280 's Advantages
Larger VRAM bandwidth (240.0GB/s vs 112.0GB/s)
768 additional rendering cores
AMD Radeon RX 560 's Advantages
Released 3 years and 1 months late
Boost Clock has increased by 37% (1275MHz vs 933MHz)
More VRAM (4GB vs 3GB)
Lower TDP (75W vs 200W)