I'm looking to add a third video output, either DisplayPort or HDMI, to a Dell Pro Slim desktop, model QCS1250.  According to the manual, this should be possible, but it doesn't list a part number for the module. I've looked around, but all of the Dell video modules I've found online appear to plug in to the motherboard with a cable, whereas the module pictured in the manual for this system looks different and appears to plug in directly to the board. Does anyone know where I can get a video port module that will fit this system? Thanks.