AMD Radeon R9 270 's Advantages
Larger VRAM bandwidth (179.2GB/s vs 96.00GB/s)
640 additional rendering cores
AMD Radeon RX 550X 640SP 's Advantages
Released 4 years and 5 months late
Boost Clock has increased by 16% (1071MHz vs 925MHz)
Lower TDP (60W vs 150W)