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While the Intesnity doesn't do realtime scaling, it does have dual video/audio capture and preview via HDMI.You know... the link I gave you was the MXO2... I suggest the MXO.
http://www.matrox.com/video/en/products/mxo/
Remember too... this will do REAL TIME downscaling. Someting the Intensity won't. Where Intensity allows for HDMI capture, MXO is the monitoring solution of choice. SDI w/ audio... yes, DVI not HDMI but I really think you should look again.
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