So, I was in the local Apple Store tonight, and got to playing with a 2011 27" iMac. In the system information, under displays, the built-in display was listed, following by 4 additional displays, all ...
As long as you need both external displays to show the same content, it should work fine. So you'll have the iMac display and a second display that is an expansion but mirrored on both displays, or ...
The ability to have two or more external monitors connected to your Mac in Extended Mode is a liberating screen experience, but leads to frustration when each still operates like an independent ...