Was this sarcasm? (Honestly couldn't tell)
But as someone who has extensively used the ODAC from Mayflower Electronics, I can personally say that I notice a massive difference in quality. It's not really about avoiding noise, it's about replacing the; often sub-par, onboard DAC with something of higher quality and with that, lack of PC noise. If I use the onboard sound I will often pick up interference as I live close to a FM radio tower. On the DAC, no interference at all.