AMD Radeon R9 280 's Advantages
Larger VRAM bandwidth (240.0GB/s vs 112.0GB/s)
384 additional rendering cores
AMD Radeon RX 5300 XT 's Advantages
Released 5 years and 7 months late
Boost Clock has increased by 98% (1845MHz vs 933MHz)
More VRAM (4GB vs 3GB)
Lower TDP (100W vs 200W)