Two motherboards are large socket mobo.

The other two... One looks to be a bread board with all the circuits being made by soldering all the connections by hand with the wires on the back. I'm not really sure where to place that but I'm leaning low peripheral. The green board looks to have some heavier low value components on it but also has the ICs and maybe some connectors that have gold pins, so leaning low peripheral there too.

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Here to learn more so I can recycle more
My grades are my own opinion and not an official grade from Boardsort