ATI Radeon HD 2600 XT Mac Edition 's Advantages
Lower TDP (45W vs 150W)
NVIDIA GeForce GTX 660 Ti 's Advantages
Released 4 years and 6 months late
Boost Clock980MHz
More VRAM (2GB vs 256GB)
Larger VRAM bandwidth (144.2GB/s vs 25.60GB/s)
1224 additional rendering cores