Thanks for the answers, I will look into QC visualizer. My plan is to use a HD5770 (1giga) graphic card for the three projectors, and use the default QT 120 (512MB) for the control monitor. So the three projected screens are being handle by one card and one QC composition, and control screen by another card and QC comp. The comps will be connected by network patch. Does the OS still works as if it a single screen in four monitors? Does it still make "big junks of memory have to be copied from one graphic card to the other via the internal bus". ?
Thanks again. Mario
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