NVIDIA GeForce GTX 950 Low Power 's Advantages
Boost Clock has increased by 11% (1190MHz vs 1071MHz)
Larger VRAM bandwidth (105.8GB/s vs 48.00GB/s)
128 additional rendering cores
AMD Radeon 550X 640SP 's Advantages
Released 2 years and 1 months late
More VRAM (4GB vs 2GB)
Lower TDP (50W vs 75W)