RAMDACs are not being used on DVI connections. Issues like black/white transition edge quality, color reproduction linearity and pretty much all else that mattered for a good analog signals are moot points now, although Matrox marketing are trying to stretch them over. A DVI signal shifts the original, unchanged display image information into the display unit, digitally, and loss-free. Signal quality on DVI serves only one purpose: Getting a stable data connection - and if you have one, you get the ORIGINAL data, straight digital from the graphics card's actual frame buffer, out the other end; if you don't have one, you'll get useless garbage.