Is there a way to check whether it's using RGB model or YUV or another ?
Computer displays are using rgb model. As you can see by looking at the signal description of the interfaces VGA or DVI. The CMYK model (subtractive color model) for example is used for Color Printers. It´s because of the base color. The additive model uses black asbase color (as your computer display is in default state). The subtractive model uses white as base color (as the piece of paper you want to print something onto).