High end motherboards have pretty sophisticated audio systems, mine features a 10 channel DAC.
My Asus Dark Hero:
ROG SupremeFX audio technology delivers an exceptional 113 dB signal-to-noise ratio on the line-in connection to provide best-ever recording quality. There's also a low-dropout regulator for cleaner power delivery to the SupremeFX S1220 codec, an ESS® ES9023P digital-to-analog converter for superior front-panel output, and a Texas Instruments® RC4580 op amp for high gain with low distortion — all to produce unmatched audio quality.