Kensington USB 3.0 adaptor multi Display adaptor

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Have a need to attach more monitors to your USB 3.0-equipped Mac, but don’t want to use a Thunderbolt, Mini DisplayPort, or HDMI port? Kensington may have just the thing for you — the Universal Multi-Display Adapter (US$79.99 MSRP), AKA the USB 3.0 Multi-Display Adapter.

Previously this device was available only for PCs, but new drivers available from DisplayLink make the adapter compatible with any Mac running OS X Snow Leopard, Lion, or Mountain Lion. Essentially what the adapter does is makes one of your USB 3.0 ports available to drive a monitor or projector. It’s a small (2″ x 3.5″ x .68″) black box with a SuperSpeed USB 3.0 input on one end and a female DVI connector on the other end. That’s a bit unfortunate, since many monitors are also equipped with a female DVI connector so you’ll need to buy another adapter. LIkewise, the included DVI to VGA adapter is relatively useless — although it plugs right into the Multi-Display Adapter, it has a female connector on the open end, once again requiring a male to male adapter cable to connect to many VGA ports.

Since the Mac software is relatively new, you need to download and install it prior to running the device. It takes up only about 16 MB of storage, and requires a reboot. After installing the software, I was able to find a male-to-male VGA cable, so I plugged one end into the 17-inch ViewSonic monitor I use with my MacBook Pro with Retina display, the other into the DVI to VGA adapter, and then plugged that into the Multi-Display Adapter. Next, the USB cable was plugged into the MacBook Pro, and the screen came right up at a resolution of 1920 x 1080 (also known as 1080p). The adapter will support resolutions on an external device of up to 2048 x 1152. As you’d expect, the Adapter is bus-powered and requires no external power.
I previously had some issues when testing a Mini DisplayPort to HDMI adapter when connecting a MacBook Air to a PC projector, so I thought I’d try the projector with this adapter (in most cases, I’ll actually just use an HDMI cable to go straight from the MBP to the projector). Once again, the adapter worked like a champ, allowing me to drive the projector flawlessly from the MacBook Pro.

Considering the variety of video output modes that are available on most modern Macs — HDMI, Thunderbolt, and Mini DisplayPort — you might not need to have a USB 3.0-based adapter to add a monitor to your setup. However, it’s nice to know that the option exists, and that the price tag on this adapter isn’t too bad — it was selling on Amazon today for $20 off the MSRP.

Conclusion

If you’re looking for a way to hook up a DVI or VGA monitor to a Mac through USB 3.0, the Kensington Universal Multi-Display Adapter is a bus-powered alternative that may fit your needs.

Positive

Provides a way to connect a monitor, projector, or other display to your USB 3.0-equipped Mac without using a Thunderbolt, Mini DIsplay Port, or HDMI port
Can also be used with Windows PCs
DVI / VGA out works with a lot of monitors and projectors
Price isn’t too high at retail, although generic adapters (Monoprice, etc…) might be less available for less
Cons

Female out on both adapter and the DVI/VGA adapter is annoying; need to use a male by male cable (not included) to plug into most monitors and projectors.

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