Question Buzz sound even with externat AMP/DAC

Sep 23, 2019
Hey, I just posted few days ago my problem with sound.

Whenever I play any game and my GPU usage goes above 95% i can hear this buzz sound in my right headphone. It's barely noticeable but it's there and it's annoying.
So I've decided to invest in external AMP/DAC. I bought Sennheiser gsx 1200 pro. Buzzing sound in games is gone but instead it's buzzing like all the time.

What I've tried:
  1. Connecting DAC to separated USBs on my mobo marked as "DAC-UP"
  2. Connecting DAC to any USB on the back and on the front
  3. Reinstalling drivers
  4. Switching between modes
  5. Connecting those cheap headphones they gives in smartphone boxes
All the time i can hear this buzz sound. I thought external DAC and DAC-UP usb ports should solve all the problems but instead of buzzing ingame i got buzzing all the time.

My rig:
Intel Core i7-9700k
MSI RTX 2080 super gaming x trio
Gigabyte Aorus Z390 master
Corsair RMx 750W
G.Skill Ripjaws V - 16GB (2x8), 3200MHz
SilentiumPC Armis AR7X TG RGB
HyperX Cloud

Any idea what might be the problem?