Hi, is there any suggestion or is there any graphics card used previously (internally or by other customers) with multi-display? I´m planning to release a multi-display application for 7 monitors and I´d like to know if there is any info about good graphics cards to avoid buying 3 o 4 until I get the good one =)
Maybe @karl_jones is familiar with this topic, because it´s a serious game application.
What about USB to HDMI converters?
Not something I have a lot of experience in. In the past I have used machines that have multiple GPU in order to get past the limitation of video output ports. I believe most Nvidia cards support up to 4x displays so you should be able to run 7 using 2 cards and a motherboard that supports 2 GPU, you wont be able to run in SLI though(AFAIK) 
Not sure about USB to HDMI, sounds like a bad idea for 3D graphics but I have never tried so maybe im wrong! 
Fantastic! I´ll talk with our IT guys