AMD Radeon R9 280X 's Advantages
Larger VRAM bandwidth (288.0GB/s vs 112.0GB/s)
1280 additional rendering cores
AMD Radeon Pro W6400 's Advantages
Released 8 years and 3 months late
Boost Clock has increased by 133% (2331MHz vs 1000MHz)
More VRAM (4GB vs 3GB)
Lower TDP (50W vs 250W)