Noisy PC case and motherboard microphone?

So the microphone connections on my desktop PC are rustling. Both front and back. It can't be due to the headset, as only minimal background noise can be heard on the laptop and mobile phone, which is probably due to the fact that the headset only costs 50 euro. I find it a bit strange that both connections are noisy. Maybe someone has a solution?

Yes sorry. If you put in a chip that costs a couple of cent, what do you expect? In the normal PC there's just noisy. For that you have to buy a sound card or a USB audio interface

Make sure that your socket has connected the protective conductor & make a foro from the power supply sticker

Front or back doesn't matter. Both depend on the same preamplifier.

Sorry I accidentally came across not helpful😅

But you often hear that the connections on the case, especially if it is a cheap one, are not really good. That's why it irritated me that the connection directly on the mainboard was also noisy, as this is actually a good one (Asus H87 Pro)

Cheap connections, however, do not make noise. If so, they have a loose contact or don't go at all.