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I have a computer with two DVI outputs in which i have plugged one 24" and one 20" monitors. I'd like to plug one more monitor to my computer. What do I have to do?

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up vote 9 down vote accepted

Easiest solution - If you have any other output such as VGA, get an adapter and use it.

If not, get a second graphics card and use that - you can just get the cheapest one that will fit - it should do the job.

Edit - As Shoeless said, you must use same manufacturer for Windows Vista, but I do not think there is such limitation in either Windows XP or Windows 7. If you are using *nix or anything else, I do not know in advance if it will work.

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1  
Just FYI, VGA is an analog video interface standard. Using an adapter is still a good idea, though. – Jim Fell Dec 17 '09 at 14:55
    
+1 @ Jim, not sure why I wrote that :S I basically meant any output apart from S-video / tv-out or anything else resolution limited... I will get rid of the word digital! – William Hilsum Dec 17 '09 at 14:58

NOTE: Depending on your OS, when using a second display card, it might be necessary to use an identical chipset- so if your curent card is an nVidia, make sure your second card is an nVidia... or ATI, etc.

I learned this the hard way. Theoretically you could get them to cooperate using XP drivers, but really, not a good idea.

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4  
Important hint to prevent head aches! +1 – EricSchaefer Dec 17 '09 at 14:27

There is also Matrox DualHead2Go and Matrox TripleHead2Go they divides one monitor output into two(or three) so you can easily add multiple monitors.

And also external USB graphics cards

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My experience with external USB graphics cards is universally bad for anything other than basic "office" type work. Never try to use a USB plugged monitor for video, games, or anything else graphically intensive. – BBlake Dec 17 '09 at 19:17

The newer ATI HD5xxx series supports a larger number of displays. Normally three on the usual cards (check the connectors, some single-slot cards won't have enough digital connectors).

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+1 ATI's new Radeon HD 5xxx is the way to go, multiple cards may only cause unwanted lagging. – Molly7244 Dec 17 '09 at 19:22

Depending on what you want to use it for, I haven't tried any USB adapters, but I imagine they would not be amazing quality compared to another graphics card, so if you are only going to be using it for something like web browsing or emails, then a USB adapter may be perfect for you, however if you plan to do anything which requires a lot of data to be processed, for example if you were playing a game or watching a video then a 2nd graphics card is the way to go. However your motherboard will need to support dual graphics card, and support SLI (NVidia) or CrossFire (AMD) to allow you to use 2 graphics cards simulataneously, and obviously the cards would have to support this aswell. Which is why you can see, a USB adapter would be easiest for something small.

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