AMD Radeon HD 8970M 's Advantages
More VRAM (4GB vs 2GB)
Larger VRAM bandwidth (153.6GB/s vs 96.00GB/s)
640 additional rendering cores
AMD Radeon RX 550 Mobile 's Advantages
Released 4 years and 2 months late
Boost Clock has increased by 43% (1287MHz vs 900MHz)
Lower TDP (50W vs 100W)