AMD Radeon HD 6850 's Advantages
Lower TDP (127W vs 195W)
NVIDIA GeForce GTX 680 Mac Edition 's Advantages
Released 2 years and 6 months late
Boost Clock1058MHz
More VRAM (2GB vs 1024GB)
Larger VRAM bandwidth (192.3GB/s vs 128.0GB/s)
576 additional rendering cores