NVIDIA GeForce GTX 880M 's Advantages
More VRAM (8GB vs 4GB)
Larger VRAM bandwidth (160.0GB/s vs 112.0GB/s)
640 additional rendering cores
AMD Radeon E9260 MXM 's Advantages
Released 2 years and 6 months late
Boost Clock has increased by 21% (1200MHz vs 993MHz)
Lower TDP (50W vs 122W)