What's the bandwidth and form factor for PCIe x1 x4 x8 and x16?

PCIe x1: These are the smallest PCIe slots, used for almost any other cards like average network adapters and USB expansion cards PCIe x4:

Hi everyone, I want to upgrade my custom build TrueNAS to 10GbE However, I find that the motherboard only remain a PCIe x1 (in x16

x16pciexp slot A PCIe x1 slot is a type of expansion slot on a computer's motherboard that provides one lane of PCIe connectivity It is designed to support low-bandwidth

x1 slot PCIe x1 slots replace the standard PCI port and are about 1 inch long They move data on and off the motherboard at up to 250 MBps in