What is the purpose of the PCIe X1 slot

1 additional PCI-Express x1 slot is needed pcie 1 slot According to PCIE Expresscard , a x1 card can be inserted into the x4, x8, and x16 connectors 15 This is referred to as up pcie gpu slot I have a PCIe x1 slot for network adapter card can any one tell me how many ethernet port i can connect on it

pcie 4 ssd in pcie 3 slot There are two possible meanings for PCIe1: PCIe and PCIe x1 PCIe refers to any PCIe slot which uses the first version of the PCIe