Sorry if this has been asked before. I'm sure parts of this question are familiar but other bits are more complex. 1st off I have a 27" iMac with 2x thunderbolt ports. I'm aware I can just use mini-DP to DVI adapters to connect these 2 ports to my 2 23" Cinema Displays. The iMac is in the centre & the 2x ACD's left and right on arms and I can't rearrange them. 1: Is there a benefit to using active adapters over passive. If so is this benefit better picture quality, lower gpu/cpu usage or what? 2: After hearing horror stories from fuzzy picture to Minidp to dvi adapters starting to burn anyone recommend good 3rd party adapters? The Apple ones are seriously overpriced imho. 3: I do a tonne of research & on my previous setup used Sharemouse over 2 x Macbook Pros & a Mac Mini. This gave me 3 monitors, 16 Spaces each, total 48, each designated to a particular function or program. As the 3 monitors were actually separate systems if I invoked Spaces on 1 screen/system I got the 16 Spaces displayed but the other 2 screens remained displaying as they were. Now I'm only on one system I've lost that ability. I use Mountain Lion with TotalSpaces from Binaryage (if you haven't tried it & love Specs on Snow Leopard just do it, you won't regret it) to give me back the basics of the more productive SL layout. Is there any way to bring back that 3 system functionality with Spaces acting independently on each screen? Its fundamental to my workflow. 3: Anyone used Matrix Dual-head adapters. I'm looking at these 2 http://www.matrox.com/graphics/en/products/gxm/dh2go/digital_se/ http://www.matrox.com/graphics/en/products/gxm/dh2go/displayport/ The Digital SE is marked Windows only but I'm researching if I can get it to work on Mac and at least I'm guaranteed its dp-dvi convertors won't burn my apartment down when I'm not looking. The DP is mac compatible out of the box. It would free up a thunderbolt port which is good for later expansion but I'm wondering if I can arrange the displays so the desktop shows left to right Matrox ACD 1 - iMac - Matrox ACD 2. All I've seen is the 2 monitors being outputted to side-by-side which means the iMac would have its desktop but the 2 outputted monitors would both appear to OSX to be on the right or left of it which is not good. Sorry for the long post but I can't find definitive answers to the above anywhere. Thanks.