AMD Radeon HD 8970M 's Advantages
More VRAM (4GB vs 2GB)
Larger VRAM bandwidth (153.6GB/s vs 96.00GB/s)
768 additional rendering cores
AMD Radeon RX 540X Mobile 's Advantages
Released 4 years and 11 months late
Boost Clock has increased by 35% (1211MHz vs 900MHz)
Lower TDP (50W vs 100W)