AMD Radeon RX 580X Mobile 's Advantages
More VRAM (8GB vs 2GB)
Larger VRAM bandwidth (256.0GB/s vs 48.00GB/s)
1792 additional rendering cores
AMD Radeon 540 Mobile 's Advantages
Released 11 months late
Boost Clock has increased by 4% (1124MHz vs 1077MHz)
Lower TDP (50W vs 100W)