[erdaniels]

I've noticed a sound card sounding better for higher impedance headphones and also having reduced interference from the onboard circuitry (from being further away?). That being said, I also had to calibrate my setting a whole lot more to get better audio which seems to be how it goes for hifi audio equipment. I've just stuck to onboard for a long time and it's usually pretty darn good sounding with my sennheisers.