What type of PCI-E does my slot have?

SYONCON PCIe Multiplier, PCIe Splitter 1 to 4 PCI-Express 16X pci 4 in pci 3 slot PCI Express pcie m2 slot The following image shows the PCI connections of the motherboard used in DuroPC's IMB540-4 Notice 'SLOT 13' are PCIe x16 slots but only Slot 3 has an x8

pcie x32 slot Unlike a more obvious and drastic upgrade where you can see the difference in the connector itself, PCIe 3 and 4 drives look identical from