In Media Res, i pinpointed down to the 1st USB3 controller..



yes that one asrock advises to connect devices for best performance... no wonder it was the same controller, 1 year back, that gave me from start various problems.. - the other 2 (1 in case of Extreme4) controllers which are connected thru multiplexer chip, may work with lower performance but do work stable in general. Also the same one controller is that which from time to time, cant find resources on windows (check pix)



(After disabling 1 by 1 and checking) i found that just disabling it and reboot, resulted in much much better performance.



Also noticed some correlation in dpc latency spikes, when i had enabled from realtek control panel the noise cancelation option in mic settings, with that enabled, it could pop (not so often) 1 "14k" spike, with it disabled, it was more stable.