I just finished putting together my first Roon/ ROCK installaton on a new NUC8i7 (in a Turing case) with ethernet connection to xfinity router. Equipment powered through an APC conditioner. Very noisy listening with two of the three usb DACs I tried wired to the nuc8, whether music playing or not. Noise increases with volume.
First dac, S.M.S.L M8 ver. 1 (external switching ps). Second was a Questyle dap in dac mode (battery power). Both had a high level of random noise, and a regular beep at about 1Hz (about 30 dB down) Very audible. The Questyle was only slighty better of the two.
But a Grace m903 was was immune, with no noise heard up to full volume. Prefer not to use this one for conversion though.
I tried the m8 powered from a wall socket without improvement, but it was an adapter to remove the ac ground connection on the nuc’s power cord that eliminated all audible noise.
So, happy listening now, but not sure this was ideal solution. Kind of like to figure out what’s going on. Maybe I’ll try cutting usb power circuit.
fyi- I have been searching this problem, but didn’t see much.