A few months ago, I purchased the StarTech USB to VGA adapter
for my system. I got tired of the single display and going with a USB adapter was a lot easier than modifying the computer itself to support two displays.
Going by the reviews on Amazon, I decided on the USB32VGAEH model which supports USB 3.0, VGA displays and includes a pass-through USB port. There are also models that will enable you to add a new DVI and HDMI display through a USB port.
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