Noisy motherboard audio codec

unknownmiscreant

Prominent
Jul 23, 2017
2
0
510
I recently completed a Ryzen PC build, and discovered the audio output jacks play a high pitched whine to my speakers. I have tried multiple different sets of speakers and all play the high pitched noise. This issue is also present on clean installs of both windows 10 creators and anniversary, with both driver versions available on the Asus website. I have found the noise vanishes when the CPU is under heavy load, such as Cinebench R15.

My specs are below:

AMD Ryzen 7 1700X - OCed 3.92GHz @ 1.375V. Cooled by custom water loop from EK.
Asus Crosshair VI Hero - BIOS v1403.
16GB G skill Flare X 3200Mhz CL14.
Gigabyte GTX1050ti 4GB OC windforce - OCed 1911Mhz
EVGA 850 G2.
Asus Wifi card (based off Intel 8260AC)
Corsair 460x case.
Intel 540s SSD boot drive, Intel 520 SSD and 2.5" WD Caviar black as overflow storage.
I built the audio system myself, however the issue persists on other speakers I purchased, and I have never encountered this type of issue with the speakers I built before.

I am running Win 10 Creators with all latest updates and drivers. I have tested whether it is the overclock causing the issue, and have reset the bios to the optimized defaults. This made no difference, however I found the noise was quieter in the bios and before the windows login screen. As I stated above, the noise dissapears when running Cinebench R15.

If anyone has any ideas I would be grateful.
 

unknownmiscreant

Prominent
Jul 23, 2017
2
0
510
Update: Connecting the ground and signal lines of the line out jack to a unity gain differential amplifier before the speakers has solved the problem. It appears the noise is common to both the ground and signal lines. The signal is the difference, so a unity gain op-amp differential amplifier solves the problem, by filtering out the common noise but keeping the actual signal.
 

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