Its easy to maintain high video resolutions of 1900 x 1200. DVI Video Switch, VGA Switch and HDMI Switch are the most used of video switcher types. The dvi switch is the most used video switching device. DVI switch is compatible with both Windows as well as MAC. Most DVI interfaces from devices such as PC’s, TV’s, VCR’s, and DVD’s are supported by them. Equipped with built in amplifier circuits eliminating video signal degradation, they have the ability to switch to sleep mode when video signals are not available. Switching between different sources of video is possible with push buttons located on the front of the unit or via RS232 or infra red remote.
Key feature of this switch is that since it has an audio option, separate setups for display and audio are not needed.

HDMI Switch on the other hand provides user with the capability to connect several HDMI video sources, like DVD, set-top box or PC, and switch them on one HDMI video display unit.
Some brilliant posts related to vga video switches worth reading.
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