AMD Radeon RX 6400 's Advantages
Released 3 years and 2 months late
Boost Clock has increased by 50% (2321MHz vs 1545MHz)
Lower TDP (53W vs 175W)
AMD Radeon RX 590 's Advantages
More VRAM (8GB vs 4GB)
Larger VRAM bandwidth (256.0GB/s vs 128.0GB/s)
1536 additional rendering cores