I have used a 2nd screen off my 24″ imac for quite some time, and I had a 3rd screen, another 20″ monitor, just sitting there idle 90% of the time… I would sometimes use it as a larger screen for a laptop or my netbook… But most of the time it sat dark.
I have looked into a few different solutions to use the 3rd screen via USB, but they were either too expensive (in the $250-300 range), or they would just create one large extended 2nd screen. (Which meant the 24″ screen would be on on side, and the two 20″ screens would need to be right next to each other on one side or the other… I never liked that lack of symmetry. 🙂 )
But when OWC came out with their USB to DVI adapter at just $99, I had to give it a shot. I did exchange a few emails with OWC tech support to try to determine that this was what I was looking for, and while the responses weren’t as clear cut as I would have liked, it seemed like there was a decent chance it would work. So I ordered it knowing I could return it if it did not do what I wanted…
Here is what it looks like — as you can see, it works!
While the manual is not well written, and it is 95% for windows, I was able to figure it out, and it integrates nicely with OSX System Preferences once you install the included software… It works just like any other extended display on osx, where you get an individual display pref scren for each monitor:
And you can set up the “arrangement” however you like:
So far I have been very happy with it. It integrates fine with Spaces, which was one of my concerns. I am still not 100% sure how I will use all this screen space… Having 3 screens and 4 spaces may not be the ideal set up anymore, and I may drop spaces, or use less spaces.