NVIDIA GeForce GTX 880M 's Advantages
More VRAM (8GB vs 4GB)
Larger VRAM bandwidth (160.0GB/s vs 109.4GB/s)
640 additional rendering cores
AMD Radeon RX 560 Mobile 's Advantages
Released 2 years and 10 months late
Boost Clock has increased by 4% (1032MHz vs 993MHz)
Lower TDP (55W vs 122W)