I had a GTX 750 and I was being plagued with screen blackouts while playing League of Legends. My GTX 750 Ti came in today and I installed it, and in my second game my screen blacked out 2-3 times in 3 mins. Before, when I had the 750, I've done tons of trouble shooting, memory tests came up fine, no errors on my SSD, reinstalled my OS (win 10), solved sfc scan problems, and so I thought that it has come down to a faulty graphics card. I had this GTX 750 for a year now and i started to experience this issue about 7-8 months after assembling this PC. The temperatures are fine.