Use the Blur Busters Frame Skipping Test (testufo.com/frameskipping). Take a photo of the screen with a long exposure; any gaps in the UFO pattern indicate your monitor is skipping frames, meaning the Hz is too high. Dial it back.

An "Hz unlocker" is a tool, script, or modification designed to bypass artificial or default refresh rate caps on a display. While the term might sound like a magical overclocking utility, the reality involves a mix of driver edits, custom resolutions, and EDID (Extended Display Identification Data) overrides.

Operating a screen at 120Hz continuously can consume 20% to 30% more power than 60Hz.