ATI Mobility Radeon HD 5850 Mac Edition 's Advantages
416 additional rendering cores
Lower TDP (30W vs 100W)
NVIDIA GeForce GTX 580M 's Advantages
Released 1 years and 5 months late
More VRAM (2GB vs 1024GB)
Larger VRAM bandwidth (96.00GB/s vs 64.00GB/s)