AMD Radeon R9 280 's Advantages
Lower TDP (200W vs 300W)
AMD Radeon RX 7900 XT 's Advantages
Released 8 years and 8 months late
Boost Clock has increased by 157% (2394MHz vs 933MHz)
More VRAM (20GB vs 3GB)
Larger VRAM bandwidth (800.0GB/s vs 240.0GB/s)
3584 additional rendering cores