ATI Radeon HD 5870 Mac Edition 's Advantages
Larger VRAM bandwidth (153.0GB/s vs 38.40GB/s)
1456 additional rendering cores
NVIDIA GeForce GT 640 OEM Rebrand 's Advantages
Released 1 years and 10 months late
More VRAM (1536GB vs 1024GB)
Lower TDP (75W vs 228W)