ATI Mobility Radeon HD 4670 Mac Edition 's Advantages
Lower TDP (35W vs 122W)
NVIDIA GeForce GTX 880M 's Advantages
Released 4 years and 6 months late
Boost Clock993MHz
More VRAM (8GB vs 256GB)
Larger VRAM bandwidth (160.0GB/s vs 25.28GB/s)
1216 additional rendering cores