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I believe the only difference between them is the 950D has a Dual link DVI port a HDMI and a DisplayPort where as the 750D just has the HDMI and DisplayPort.
So you must have a Displayport on your graphics card if you want to take advantage of the 120Hz on the 750D as I think the HDMI is locked at 60Hz.
Thanks. orded one. looking forward to monday now, never thought i'd say that with it been the weekend.