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I currently have a dual monitor setup, but I would like to expand to 3 monitors. My motherboard only supports 1 PCI-E card, so I was wondering if it's possible to head a triple-output video card? It seems almost all cards are dual-output, but I haven't been able to find any triple-output cards. Any help would be much appreciated. Thanks!

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Many cards offer 3 display ports, but most can only drive 2 displays at a time.

I would like to expand to 3 monitors.

For this, you'll want a ATI Radeon HD 5xxx.

Drive three displays simultaneously with independent resolutions, refresh rates, color controls, and video overlays.

The ATI Radeon HD 5670 would be the entry level card, price around $100.

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The ATI Radeon HD 5750 costs around $135.

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All ATI Radeon HD 5xxx support Eyefinity multi-display technology:

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Thanks, this does seem like a good option. – Jon Tackabury Jan 19 '10 at 2:09
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Matrox also specializes in multi-monitor video cards. The M9138 LP PCIe x16 seems a good fit.

The Matrox M9138 LP PCIe x16 triple graphics card renders pristine image quality on up to three DisplayPort monitors at resolutions up to 2560 x 1600 per output, for an exceptional multi-monitor user experience. With 1 GB of memory and advanced desktop management features, such as independent and stretched desktop modes, the M9138 drives business, industrial, and government applications with extraordinary performance. Its low-profile form factor makes it easy to integrate into a wide variety of systems. It offers multiple operating system support, and can be paired with another M-Series card for additional monitor support.

You may also be interested in one of their other products, the TripleHead2Go:

Matrox TripleHead2Go is an external multi-display upgrade that adds up to three monitors to your notebook or desktop computer. Ideal for professionals requiring more desktop space for maximum productivity increases and gamers wanting a totally immersive experience, this small box lets you run different applications on each display or view one application across up to three monitors. Available in DisplayPort, Digital, or Analog Editions.

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$300 for that??? don't know about you, but i prefer a high-powered 3D card with Eyefinity and directX 11 support for $100 :) – Molly7244 Jan 19 '10 at 2:11
I never said it was cheap. The advantage is it can easily be used with any system which only has 1 monitor output, so you can move it from your laptop to your desktop to your work computer easily. Video cards on the other hand, not so much. – John T Jan 19 '10 at 2:16
i know, they're cool for laptops, but for a desktop, i'd rather not. (and aren't they a Canadian company? :) i remember when they were the big kids on the GPU block ... but their glory has somewhat faded, and not exactly undeserved (long story). – Molly7244 Jan 19 '10 at 2:33
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In case you need to use NVIDIA-specific featuers, the GTX 590 and GTX 295 (both close to $800) both also support simultaneous triple head output. See NVIDIA's surround technology page, and click "Connector Recommendations" for more info.

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nVidia's 670/680 single GPU cards support 3 DVI/HDMI outputs. It's possible the kepler based low/mid range end parts will as well (the ones based on the older Fermi design won't); but I can't find any specific information on the low end ones and the mid range parts aren't out yet. – Dan Neely May 11 '12 at 14:00

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