can you put a pcie x1 in a x16 slot - What is PCIe x1 slot used for? 888 slot 35

The PCIe x1 slot has only one PCIe lane. Although there is only one PCIe lane, the PCIe x1 slot can be used for a variety of low-power PCIe peripheral cards. The PCIe x1 slot is the smallest PCI Express slot and has the lowest throughput compared to larger PCIe slots such as the PCIe x16 slot. Ho...

You can use PCIe cards of a lower lane width (e.g., x2, x4, or x8) in a higher lane width slot (e.g., x16) ... Do I Need an Adapter to Put a Shorter PCIe Card in a Longer Slot?

Similarly, you can put a PCIe x8 card in a PCIe x4 slot, but it will operate at half the maximum bandwidth of a PCIe x8 slot.