Here’s another idea. In that image, directly below these FETs you can see the little crab logo on the chip. That’s the audio driver. It’s possible these FETs are muting FETS for the analog audio channels. Basically they hold the audio lines down while you connect/disconnect your audio devices. If the motherboard supports 9.1 audio, that’d explain why there’s 10 of them. One per channel.

Like this: Image