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Strangely 4K monitor will only run at 30hz (used to do 60hz) when another monitor is plugged into the PC's HDMI port - USBC-6950-HDMI - Plugable Support
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Ultra-HD und 4k-Displays - Kauftipps und 15 Modelle in der Marktübersicht - UHD-Monitore: 4k nur mit 30Hz per HDMI?; UHD-TV-Geräte
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Kvm Switch 2 Monitore, Steetek 4K@30Hz USB2.0 HDMI KVM Switch Dual Monitor, HDCP1.2 2 PC 2 Monitor Switch mit Hotkey und Button Control für Tastatur, Maus, Drucker und HD-Monitor : Amazon.de: Computer
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