NVIDIA GeForce GTX 780 6 GB 's Advantages
More VRAM (6GB vs 3GB)
Larger VRAM bandwidth (288.4GB/s vs 240.0GB/s)
512 additional rendering cores
AMD Radeon R9 280 's Advantages
Released 6 months late
Boost Clock has increased by 3% (933MHz vs 902MHz)
Lower TDP (200W vs 250W)