ATI Mobility Radeon HD 4670 Mac Edition 's Advantages
Lower TDP (35W vs 250W)
AMD Radeon R9 M485X 's Advantages
Released 6 years and 8 months late
More VRAM (8GB vs 256GB)
Larger VRAM bandwidth (160.0GB/s vs 25.28GB/s)
1728 additional rendering cores