What exactly does the spec “PCIe x16 slot ” mean?

pcie x 16 slot
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2 SSD, Support PCIe x4 x8 x16 Slot USB Type C ·

It's a slot of x16 size but electrically x4 This

pcie slot dimensions Also I forgot to say before I went to bed last night since it works as it should in the second PCIE x16 slot I would replace the Motherboard

pcieslot PCIe x16: This is the largest PCIe slot with 16 data lanes PCIe x16 slots are associated with graphics cards and provide the highest bandwidth