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

Can using up other PCIe 1x slots affect GPU performance on the first pcie 1x slot So, there is no singular PCI Express slot There are actually four sizes : PCI Express x1, PCI Express x4, PCI Express x8, and PCI Express x16 pcie 30 in 40 slot PCIe 1 to 3 PCI Express 1X Slots Riser Card Mini ITX to External 3 PCI-e Slot Adapter PCIe Port Multiplier Card Note:If your graphics card is a different

pcie 3 slot 1 x PCIe x16 slot Intel® B760 Chipset 1 x PCIe x16 slot 1 x PCIe x16 slot Note: To ensure compatibility of