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→Black frame insertion
For 120hz monitors.
Simulates CRT flicker, which is necessary for the human eye to perceive fluid motion. Without it, the sample-and-hold method used by LCDs manifests as motion blur to our eyes. For LCDs, running at 120Hz with black frame insertion every other frame gives you 60Hz CRT motion quality on 60fps content, and is especially effective on strobe-backlight gaming monitors (e.g. NVIDIA LightBoost, EIZO Turbo240, BENQ XL2720Z Blur Reduction).
For CRT monitors, they can use a 120Hz refresh rate to sync to 30kHz (240p) resolutions.
