Question What is this piece on the Motherboard? it piece fell off.

Something's not going to work with that coil missing. They are typically used in VRM circuits, in series with the voltage output of a phase so if missing there's no output at all from that phase.

It doesn't look like one for the VCore or VSoc VRM, which would be much bigger physically on a CHVIII. Those are multi-phase VRM's so it might work, if poorly, with one of those missing. Being as small as it is it's more likely for something else which is also a single phase VRM so that circuit would be non-functional without the inductor. Possibly an NVME possibly the chipset, possibly a memory DIMM.
 
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