NVIDIA GeForce GTX 780M 's Advantages
More VRAM (4GB vs 2GB)
512 additional rendering cores
AMD Radeon R9 M290X Mac Edition 's Advantages
Released 1 years and 6 months late
Boost Clock has increased by 22% (975MHz vs 797MHz)
Larger VRAM bandwidth (174.7GB/s vs 160.0GB/s)
Lower TDP (80W vs 122W)