AMD Radeon Pro W6600 's Advantages
Boost Clock has increased by 11% (2580MHz vs 2331MHz)
More VRAM (8GB vs 4GB)
Larger VRAM bandwidth (224.0GB/s vs 112.0GB/s)
1024 additional rendering cores
AMD Radeon Pro W6400 's Advantages
Released 7 months late
Lower TDP (50W vs 100W)