I built up a new PC over the weekend. Here are my findings:
On the new motherboard, if I use a USB 3.0 slot, I actually hear some of the interference issues that others have reported which I NEVER heard on my old PC.
If I use a USB 2.0 slot, I get no interference.
Whooshing in left cup remains unchanged. Present and annoying.
Hi
Yes - USB C / 3.0 is known to cause wifi interference because the noise from USB 3.0 is basically the same as BT + WiFi.
"...The noise from USB 3.0 data spectrum can be high (in the 2.4-2.5GHz range)"
It's why people use increasingly long extension cables but I believe that's not really the point as then, (conjecture from me) the cable is simply bringing that signal out to the dongle. In my opinion if you're seeing issues plugging into a USB 3.0 port then then it's a good idea to set that port to USB2.0 in BIOS settings.
https://uk.pcmag.com/networking/13179/wireless-witch-the-truth-about-usb-30-and-wi-fi-interference