How can I place three monitors in parallel? There is one DVI output on the graphics card. How have the output displayed on three monitors simultaneously?
What extra hardware is required?
Apparently I needed to look for a "DVI-splitter."
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We bought a (VGA) display extender that takes the video + audio signals over up to 95m of Cat 5. As an added bonus, the receiver end of the kit has 4 outputs that can be used simultaneously so this kind of approach may be viable if the displays all need to be close to each other.
A Google search for "DVI extender 4 port" also brings up a lot of kit.
i believe a matrox triplehead-2-go is able to do this. What you're looking for is called sceeen "cloning" or "cloned" mode of operation.
As explained in this excellent post by Jeff, you'll require another PCI video card for a new monitor. Note that you could get a dual-headed video card, so you'll need only one more card for your extra monitors.