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Setting Up The Extended Desktop With VGA Splitter Cable


valley_girl1919's Avatar
valley_girl1919 valley_girl1919 is offline
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06-Sep-2011, 09:11 PM #1
Setting Up The Extended Desktop With VGA Splitter Cable
OK, I have a Dell Optiplex 755 and on the back there is only one VGA video card port, but I am trying to connect two monitors and set one monitor up as the primary while using the second monitor as a extended view for the desktop of my primary monitor. What I have done is purchased a vga splitter cable with hopes of being able to set the monitors up the way I described above. First, I connected the vga male splitter cable into the vga video card and then connected one female cable end to a vga cable that is connected to a monitor and then connected the other vga female cable end into the vga cable for the other monitor. I noticed right away that both the monitors were on, but the display was showing the same desktop for each monitor. I don't want a duplicate of my desktop showing on another monitor I want to make one monitor an extension of the other monitor so I can have more room for my desktop. I tried changing settings in the display settings, but no matter what I do it just shows one monitor cloning what the other monitor has. When I click on identify it shows both monitors as being number 1. I have a feeling I am either going to have to add another vga video card or a dvi-d card? Can anyone explain to me why the vga splitter cable won't work?
Triple6's Avatar
Triple6   (Rob) Triple6 is offline
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06-Sep-2011, 11:44 PM #2
The only thing a splitter will give you is the identical display on both monitors; it won't work because its taking the single physical output connector and simply splitting it into two physical output connectors - it cannot be used to run two independent displays when the output from the video card is only a single feed.

You will need a dual port video card.

There appears to be 4 models of the Optiplex 755, the Tower takes a full height PCI-Express x16 video card, the Desktop and Small Form Factor versions take half height PCI-Express x16 cards, and the smallest ultra small Form Factor model can't take any card.
Microsoft MVP - Windows Desktop Experience
mahinder's Avatar
mahinder mahinder is offline
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Join Date: Oct 2011
01-Oct-2011, 04:07 AM #3
Yes, I support triple6. Monitor splitters only split the signal from a common video source. They cant actually show different things. Even though they require power, it is only to boost the signal.
Monitor splitter.
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