Can someone explain me the PCI-E slot variations & sizes of

Single-Board Computers with Mini PCIe Slots pcie slot dimensions Install a half-length Mini PCIe card into a full-length Mini PCI Express slot · Standard full length Mini PCIe form factor · Complete pass-through design pcie 4 in pcie 3 slot 1 slot = 20mm, with the width of 110mm

pcie 40 in pcie 30 slot Sonnet has a solution — the Echo™ I Desktop This professional Thunderbolt™ to PCIe card expansion system enables you to connect one up to full-length (