Single-Board Computers with Mini PCIe Slots

What Are PCIe Slots Used For? - Devices and Expansion pcie slot dimensions PCIe Base spec and various other PCIe specs show less , ECN, April 28 Unoccupied Slot Power Hand-off State Clarification This ECN allows the pcie slot gpu 1 slot = 20mm, with the width of 110mm

pcie gpu slot So, there is no singular PCI Express slot There are actually four sizes : PCI Express x1, PCI Express x4, PCI Express x8, and PCI Express x16