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I have a Dell OptiPlex 960 with a dual-head ATI Radeon HD 4670 card (powering two monitors) installed in the PCIe x16 slot. I'm wanting to add a third monitor to my setup, and I'm aware that using the on-board graphics card is not an option. I have three slots that aren't being used: PCIe x1 and two PCI slots. With that being said, what are some options that will allow a third monitor? Any suggestions would be greatly appreciated.

FYI: I am running Windows 7 64-bit.

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This has been asked a few times. Here is a link containing superuser search options. – opsin Jan 24 '12 at 3:55
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Why do you think using the on-board graphics is not an option? Windows 7 officially supports multiple monitors on different graphics cards with different drivers. – David Schwartz Jan 24 '12 at 5:43
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You could get another radeon gfx card. If you want to do crossfire, you want a similarly specced card, but if they're separate you may or may not run into problems. Never tried the latter before.

EDIT: You probably want a PCIe x16, but if you don't have an extra sitting in there, you should go with USB video like the other guy said.

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USB Video is the way to go. There are dozens of USB video card solutions, most support HD, etc.

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