AMD Radeon RX 6400 's Advantages
Released 8 years and 3 months late
Boost Clock has increased by 121% (2321MHz vs 1050MHz)
More VRAM (4GB vs 2GB)
Lower TDP (53W vs 180W)
AMD Radeon R9 270X 's Advantages
Larger VRAM bandwidth (179.2GB/s vs 128.0GB/s)
512 additional rendering cores