Volly: I do have a recent and nice video card. I will check for an optical output. I have the basic Modi (no optical). Please go thru the site. Like I've stated, the graphs do represent what I am hearing. There is more than one testing for Schiit DAC's (and the amps, check for build quality). End result for the DACs, they all suffer from engineering shortcomings (to a lesser degree). Although I have abused my hearing, I still best my 21 years old son and my 18 year old daughter.