So basically I can't do any value under 384, what would happen if I set it to 100? It won't start?
Not sure but i think it switchs to default frec, which I do not remenber now :-)
Sure it works well without fan at 384 (also a bit more), it will get very hot, but it works.
If Moonlander2 gets too hot, it stops mining (hang). This is a good test.
You can use USB cable to protect USB connector at MOBO.