Regarding Twinview & (2) 120Hz monitors. If you want 3D/stereo to be displayed on both
monitors (extended across both) then they need to be both connection the same way to your nVidia graphics board, meaning either both DVI-D or both DisplayPort. I've got a Quadro 4K w/ one DVI-D output & two DisplayPort outputs. I have each of my Dell Alienware monitors connected to the DisplayPort outputs via the nVidia DisplayPort to Dual Link DVI-D Converter. With much help from nVidia support we came to figure out that this was the only solution to get 3D across the (2) monitor extended setup.