Tag Archives: fixes

Fix for Samsung 750 and 950 series monitors 120Hz “Not Optimum Mode”

Use 120.8Hz custom refresh rate. Both Windows and the monitor’s OSD will show 121Hz. Actual 121.0Hz will cause the error without fail, it must be a tiny bit below. I guess there is something weird going on with the tolerances in the monitor – I’ve noticed things like mains current spikes contribute to the problem.

This may apply more to HDMI 1440×1080 or 1280×720 than to DisplayPort 1080p.

My exact settings for 1440x1080x120Hz over HDMI are as follows: