We compared two Mobile platform GPUs: 512MB VRAM Mobility Radeon HD 3870 and 256MB VRAM Mobility Radeon HD 4670 Mac Edition to see which GPU has better performance in key specifications, benchmark tests, power consumption, etc.
Main Differences
ATI Mobility Radeon HD 3870 's Advantages
More VRAM (512GB vs 256GB)
Larger VRAM bandwidth (54.40GB/s vs 25.28GB/s)
ATI Mobility Radeon HD 4670 Mac Edition 's Advantages