I'm on Windows 8 RTM x64, using the designated Realtek Drivers.
Sample: http://puu.sh/1HVew/a12007f54a01896920b954c792fe991b (Yes, this was once music)
This is not just random noise, the output is almost silent when no sound is played. This recording was done with Audacity, although I got the same issue with "Listen to this device" (+ unbearable feedback)