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

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Any PCI Express card of a smaller size will fit into a larger slot So an x1 card will fit in an x8 slot Please see the Wikipedia article for Optimised Simplified For everyone - Easy to install and run optimised software for your SBC

incredible hulk slot rtp 2*PCIe x1 5 EZ-Latch 6 Socket AM5 Supports AMD Ryzen Unlock the latch of the PCIe slot easily when remove the graphics card in the PCIe slot  Select Your Motherboard Home Product Motherboard Filters Show Out of Stock Used Products DDR4, PCIe 4, CFX, Slots, Wi-Fi 6E) Brand: MSI Model: 911-