At Last We Are Free...

"Tom's Hardware"'s extensive investigation has reached a conclusion.

Using world-class headphones, a $2 Realtek integrated audio codec could not be reliably distinguished from the $2000 Benchmark DAC2 HGC in a four-device round-up.

Read more at the source, I highly recommend you read the entire article: http://www.tomshardware.com/reviews/high-end-pc-audio,3733.html