Just wanted to inform you that I have not found out the cause for th DPC latencies, but other thing went positive since then.
With updated 0.976 WDM drivers from RME ( soundcard manufacturer ), the audio glitches went away also under high DPC latencies ( video playback ) - the driver from RME tied the results with multimedia Realtek on this.
Additionally I found out that the Renesas/NEC USB port 3.0 port/hub updated driver does not fix the audiodropouts which I had with RME Babyface. I had to move the cards usb cable the JMicron JMB362 E-sata/USB or the Southbridge ones, which worked flawlessly - no audio dropouts or sound artefacts. So its either problem of RMEs driver to sit on the USB 3.0 port or its the NEC/Renesas driver.
This post has been edited by Plutotype: 21 March 2011 - 01:46 AM