So now I’ve changed my graphic card into a AMD/MSI and the brizzle has gone, but now sometimes a channel in cubase peaks after a time. I thougt it is the USB-Driver from A&H, because on my Steinberg MR816 CSX (FW) there is no problem.
By the way, I have a Intel i7 5930K with 32GB Ram and all energyoptions are out and the system is optimized for audio.