Will PCIe x1 x4 cards work in x16 slot?

What are PCIe Slots in PC? pcie x16 expansion slot PCIe x16 Gen5 expansion backplane; 5x PCIe x16 Gen slots; 1x PCIe x16 Gen target slot; Optional bifurcation to support two PCIe x16 pcie slot bracket Tech Specs General Product Type Riser card Expansion Connectivity Expansion Slots 1 1 x PCI Express x16 - full-height ; 1

pcie2 slot x1, x2, x4, x8, x16, and x32 A PCIe card will fit into a slot of its size or bigger, but not into a smaller PCIe slot The number of lanes actually connected