NVIDIA GeForce 840A 's Advantages
Released 4 years and 5 months late
Boost Clock1124MHz
More VRAM (2GB vs 1024GB)
AMD Radeon HD 6570M Mac Edition 's Advantages
Larger VRAM bandwidth (25.60GB/s vs 16.02GB/s)
16 additional rendering cores
Lower TDP (30W vs 33W)