can you put a pcie x4 in a x16 slot - QNAP M.2 PCIe SSD Expansion Card g2g slot 888

You can have one, four, eight or sixteen lanes in a single PCIe slot, denoted as x1, x4, x8, or x16. ... Many computer motherboards today are manufactured only with PCIe slots, so progression to PCIe is inevitable.

While the PCIe x16 slot is Gen5 as supported by Arrow Lake processors, both of PCIe x4 slots on the AAT2250 board are Gen4.

Can I plug a x16 GPU card (AMD) into a x8 PCIe slot that is itself one of 4 x8 PCIe slots on a x16 PCIe riser? ... PCIe devices are adaptable and can pretty much be installed in any kind of pcie slot.