Headphone interference

[Hirsone]

I have Sennheiser HD 558's and they are getting some interference (A slight buzz noise hard to explain), i can live with it but i would like to fix it.

I am using my On board sound on my mobo (https://www.pccasegear.com/index.php?main_page=product_info&products_id=27642). I have tried a number of thing like un-plugging the front audio adn changing to power-saving mode which worked but also makes me get terrible frames in games. I know i can easily fix it by getting a DAC but i would rather not spend anymore money because i recently brought the system. I will list the specs below.

 

CPU: I7-4790k

MOBO- Gigabyte Z97X-Gaming 3

Graphics- EVGA GTX 980

RAM- Hyper X Fury 16gb

 

Thanks to anyone who tries to help.

 

[Alibaladin]

Its normal. Unless you get a dac. You'll continue to hear this from on-board audio. I know how irritating it is. So don't save the money if you're really into music.

[Laputacake]

EMI I think

[A Bubble]

Front panel ports always get disgusting interference from EMI.