NVIDIA GeForce GTX TITAN 's Advantages
More VRAM (6GB vs 2GB)
Larger VRAM bandwidth (288.4GB/s vs 112.0GB/s)
2176 additional rendering cores
AMD Radeon 550X 's Advantages
Released 6 years and 1 months late
Boost Clock has increased by 39% (1218MHz vs 876MHz)
Lower TDP (50W vs 250W)