Are you referring to sync and freesync ? Freesync is for AMD graphics cards , and is a lot cheaper . Gsync is for NVIDIA graphics cards , and is a lot more expensive . They both do the same thing . They get rid of frame stuttering if you want to know about that , theres a great video on it by tech quickie on YouTube , but I ' ll simplify it . If your GPu and monitor are not fully synced you ' re getting too many fps for the screen to render the screen can tare and freeze . Gsync and freesync remove these issues by limiting your GPu to the max output of the monitor . But they come at a price premium . I say that if you are getting a 1070 or 1080 , free and gsync are worth it . With a gtx 1060 or rx 480 however , you won ' t be getting enough frames to be heavily effected by frame stuttering really . Hope this helps