There is an incorrect posting on the Nvidia website as to the Quadro 2MXR being supported by Linux Legacy driver 1.0-96xx! Twinview will not work properly with DVI on the second port. However it is properly supported by Legacy driver 1.0-71xx.
Please update your website! Because of this error, I wasted most of my night and this morning scratching my head, looking for an xorg.conf solution to the 1-bit posterization that was the only thing coming out of the DVI port!