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I won't be using the integrated display. Right now, one external monitor is connected through a mini DisplayPort to VGA adaptor. How should I connect a second?

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Another option to to use a display multiplexer, like the Matrox DualHead2Go DP. This will have much better performance (frame rate / snappiness) than the USB solution, at about 4X the price. It's best with matched dual external displays - or triple; there's also a 3-monitor solution. I haven't used one personally, but have recommended it to clients with success. The reviews are quite good.

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An option for this MacBook Pro is to add a USB Video adapter to get that 2nd external monitor. They are available in a wide range of resolutions and connectivity. Not sure which is the best one to buy but here is an example of a USB 2.0 to DVI Display Adapter.

USB to DVI adapter Example

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Remember that these solutions are not good at graphics: you'll be able to use Excel or text editors but you won't be playing games. – CajunLuke Mar 5 '12 at 22:12
I agree! I just bought a DisplayLink adapter and tested it today... It's unusable to me :( I wish I had known about this earlier – Matthieu Napoli Mar 7 '12 at 18:58

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