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To swap between 4K at 144Hz/160Hz and 1080p at 320Hz on the Acer Predator XB273K Vbmiiprx you must use the monitor's On-Screen Display (OSD) menu to activate Dual Frequency Response (DFR) or 4K 144Hz mode. The 320Hz mode is designed for Full HD (1080p), not 4K.
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