I disconnected the audio board clock and power wires and the noise completely disappeared. I reconnected the wires and the noise reappeared. I shortened the wires and tried wiring it similarly to user Kabloui’s pictures. The noise was greatly reduced, almost negligible, but I cannot seem to completely remove the noise with the HDMI Audio Upgrade Board connected. Any suggestions? I am currently using 26 gauge Kynar for the power and clock.