Hi Viking, thanks for your thoughts,
here is my prob..https://vimeo.com/214827556
(i used a simple sinewave 24bit 48khz)
every time i move the mouse i get weird feeps and dropouts.
my usb cable is just 1m short and i tried all kind of things, differnt cables, all usb ports, deactivated usb 3.0 , 3.1 Asmedia drivers in the bios, turned off intel speedstep, intel turbo boost, ethernet, wifi, bluetooth, cpu termal throttling, cpu C-State Support etc etc. software to 100% performance and so on.
im guessing its the asrock board. so i sold it and get a Asus Sabertooth X99 very soon. I hope those USB probs are gone then. !!!!!!