ATI Mobility Radeon HD 4670 Mac Edition 's Advantages
Larger VRAM bandwidth (25.28GB/s vs 14.40GB/s)
272 additional rendering cores
NVIDIA GeForce GT 520MX 's Advantages
Released 1 years and 8 months late
More VRAM (1024GB vs 256GB)
Lower TDP (20W vs 35W)