NVIDIA GeForce 840A 's Advantages
Released 11 months late
Boost Clock1124MHz
More VRAM (2GB vs 1024GB)
Lower TDP (33W vs 100W)
NVIDIA GeForce GTX 675MX Mac Edition 's Advantages
Larger VRAM bandwidth (160.0GB/s vs 16.02GB/s)
960 additional rendering cores