AMD Radeon R9 270 1024SP 's Advantages
Lower TDP (150W vs 405W)
AMD Radeon RX 7990 XTX 's Advantages
Boost Clock has increased by 289% (3599MHz vs 925MHz)
More VRAM (24GB vs 2GB)
Larger VRAM bandwidth (1152GB/s vs 153.6GB/s)
5120 additional rendering cores