Definitely the pc rex. Leaking like a monster. I concluded it was either the mobo, Ryzen speedsteppy shiz, or the gfx card. Remember must have been 10 years ago having a similar issue in an old build, you could switch off a load of cpu stuff like spread spectrum and speedstep which basically killed the problems. I figure it's why people spend double the price for a Mac
In my last round of EMI hell, I installed a dedicated ground rod, ripped the ground from all my plugs bar 1 and still the dreaded chirp and mouse buzz!