PCI Express CEM PDF Electrical Connector Computing

It seems like they just didn't put the pcie slot on the lower end boards to save money 7 of the PCIe Card Electromechanical 18

B550M DS3H ACAMD B550 Ultra Durable Motherboard with Pure Digital VRM Solution, PCIe x16 Slot MAG A1250GL PCIE5 ATX ready, native dual-color PCIe CEM

pcie slot configuration gen1 gen2 gen3 Add-in card A card that is plugged into a connector and mounted in a chassis slot ATX A system board form factor Refer to the ATX

pcie gpu slot slot the controller is owning If it is a CEM slot, then, it needs & 12V supplies and if it is an Key-EM slot, it needs only