Yes, you can install a 1x PCIe card into a 16x or 4x PCIe slot

Yes, you can install a 1x PCIe card into a 16x or 4x PCIe slot 16x pcie slot Buy 5Pcs PCI Express 16x Slot PCIe x16 164 Pin Sokcet Straddle Mount PCB Slide Lock Female Straight Through Holes Pitch at Aliexpress for slot cutter machine A PCIe x8 card will fit in any PCIe x8 or PCIe x16 slot PCIe cards larger than the PCIe slot may fit in the smaller slot but only if it is open

slot cutter machine A x8 card will work in an x1 slot, but will be limited to x1 speeds A x8 card will also work fine in a x4 slot It will be limited to x4 speeds

aztec bonanza slot What is PCI express card? How many types of PCIe cards are there? What does PCIe x8, or PCIe x16 mean? Can I use a PCIe card in a slot FWIW the x8 vs x16 shouldn't make any performance difference with that card since your system is running it in PCIe and it doesn't need the