AMD Radeon R9 M290X Mac Edition 's Advantages
Larger VRAM bandwidth (174.7GB/s vs 32.00GB/s)
512 additional rendering cores
AMD Radeon 540X Mobile 's Advantages
Released 4 years and 3 months late
Boost Clock has increased by 12% (1095MHz vs 975MHz)
Lower TDP (50W vs 80W)