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

can i put pcie x4 in x16 slot   Dan candy palace slot

PCIe slots allow your motherboard to connect with your PC's most critical components and provide key functionality

Next Generation Storage：1*PCIe x4 and 2*PCIe x4 Connectors EZ-Latch：PCIe x16 Slot & Connectors with Quick Release & Screwless Design PCIe x4: These have four PCIe lanes, and they also can fit into a x16 slot Often used for single NVMe SSD expansion cards, they are

grand slot eu Yes, you can plug into 16x slot, but off course it will run in 4x speed Some motherboard even let you plug 4x card into 1x 1 x PCIe x16 slot 1 x PCIe x1 slot