http://www.pcgamer.com/the-best-nvidia-geforce-gtx-1050-ti-deals/

Down on the lower end of the spectrum for Nvidia's Pascal based GPUs, are the GTX 1050 and GTX 1050 Ti. They've essentially replaced the GTX 960 and GTX 950 from the 900-series with parts that consume less power and are cheaper to manufacture. The older cards have more CUDA cores, however the newer ones are clocked higher. Nvidia's new budget cards are roughly equivalent in performance to their predecessors, but you'll find them for way cheaper. 

Running on the GP107 architecture and 14nm process compared to the GP106 and 16nm on the other 10-series cards, the GTX 1050 Ti is smaller and uses less power. Despite lower clock speeds than the equivalent 900-series GPUs, the GTX 1050 Ti is better at managing memory bandwidth. The smaller size benefits you by making the card way cheaper than graphics cards from a couple of years ago.