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My desktop has a NVIDIA GeForce GTS 250 thats currently running two monitors. The Intel H55 motherboard also has an on-board VGA port. Is it possible for me to run a third monitor from this? Is there anything special I need to do to make it work? I need to know before I splurge on another monitor, and do not have a spare monitor to test with. I'm running Windows 7 Home Premium, if it matters.

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I just setup a 4 monitor system on a 3 year old Dell OptiPlex WinXP tower w/ on board Intel VGA. We tried to use the on board as a 5th monitor, but it would not work. Tried various settings in nVidia control panel, BIOS settings, and registry hacks. No dice!

Additional info: this is going to vary from motherboard to motherboard.

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What he said - in theory, yes it may work, but in practice a lot of motherboards won't support this. – Shinrai Jul 27 '10 at 19:40

Yes you can use onboard and pci express cards at the same time. Just configure in the BIOS the onboard as the main video adapter.

Then you could use even 3 monitors with extended desktop.

Go to display properties and in the 2 and 3 monitors selects the checkbox (extend my desktop to this display).

This works on Windows XP and 7. Vista and wddm 1.0 can?t run multiple video drivers

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Since you are running windows 7 (according to the tags) there are two gotchas for this.

1: Your motherboard must be of the type that does not disable the onboard graphics card if you have a video card installed. This can be checked pretty easily if you have two monitors.

2: With Windows 7, if you want to have multiple video cards, they must all be capable of using the same driver. So, if you have an onboard Intel GPU, and an nVidia card, its not going to work. Or if you have an nVidia graphics card, but the onboard uses the legacy nVidia drivers... no dice.

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I believe point 2 is only for Vista, Win7 should support video cards that support different drivers (ATI / NVidia for instance) – Alister Jan 10 '11 at 4:52

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