I'm wondering how these slot were supposed to be utilized, especially that 5.2mm (by the looks of it) DC input.

I know enough about PCI/PCI-e slots. The question is related to those specific unusual slots, I have never seen before. If possible, could you provide with some images of the hardware, which could be fit into those slots?

The case is Tracer tro-585.

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1 Answer

What the slots on the back of tower PC case are for?

They are not called "slots".
They are called "knockouts", because the inner piece of sheet metal is supposed to be knocked out (but more easily pried out) to create the opening.
The opening is typically referred to as a "cutout" (i.e. an opening cut out of the sheet metal).

The cutouts are for installation of additional connectors. The two smallest knockouts (on the left) are definitely intended for DB9 and DB25 connectors.

The cutout (or just holes) labeled "DC -- 5V, 3A" is probably for a DC-power barrel connector similar to:

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