AMD Radeon R9 370X 's Advantages
Larger VRAM bandwidth (179.2GB/s vs 96.00GB/s)
640 additional rendering cores
AMD Radeon RX 550X 640SP 's Advantages
Released 2 years and 8 months late
Boost Clock has increased by 4% (1071MHz vs 1030MHz)
Lower TDP (60W vs 180W)