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KVM Switches: Ports, Video Type and Switching

Devices that let one keyboard, mouse and monitor control several computers, from two-port desktop boxes to rack-mount IP consoles. 4,010 products from $3.99 to $6,888.99. Vszerda, YINGHUA, WRIARICH and more.

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Video input, port count and resolution on the switch

A KVM switch has to match the video and keyboard connections of every computer it serves: HDMI, DisplayPort, USB-C or D-Sub (VGA) for video, and USB or, on older gear, PS/2 for the keyboard and mouse. One box can mix connection types, and the port count is the number of computers it controls, from 2 or 4 up to 16. Mixed types, such as a DisplayPort computer on an HDMI switch, rely on adapters. The supported resolution, up to 3840 × 2160 on newer models, must cover your monitor.

Switching method, shared USB devices and rack units

Switching method decides how pleasant daily use is. Push buttons on the box are simplest, hotkeys let you switch from the keyboard, and a wired remote or desktop controller keeps the box out of the way. If you need to share more than a keyboard and mouse, such as a printer or webcam, look for a model with extra USB sharing ports. Rack consoles and IP KVMs, which fit a 19-inch cabinet, add a built-in screen or network access for remote servers.

Questions about KVM Switches: Ports, Video Type and Switching

Can a KVM switch drive two monitors per computer?
Only models with more than one monitor port can. Check that the listing shows two video outputs and two video inputs per computer; a single-monitor switch cannot extend a two-screen desktop.
Will a KVM switch pass 4K at 60 Hz?
Only if the video chipset and cables support it. Some HDMI switches pass 4K only at 30 Hz, which makes the pointer feel sluggish. Look for 4K 60 Hz in the specifications and use cables rated for it.
Does a KVM switch work with wireless keyboards?
Often yes when the wireless keyboard uses a USB receiver, because the receiver plugs into the switch like any other USB device. Some switches only emulate basic keyboards, so multimedia keys may not pass through.