What are the top uses of PCIe x1 Slots?

What are the top uses of PCIe x1 Slots? pcie x4 in x16 slot If it's a motherboard slot you're talking about it means it's a x16 physical slot but there are only x4 electrical connections, meaning that pcie gen 4 in gen 3 slot Expansion slots, 1×PCI-E x16; 1×PCI-E x16 ; 1×PCI-E x1 ; Storage devices, 1× PCI-E x4; 3× PCI-E x4; 8×SATA 6

pcie gen 4 in gen 3 slot The PCI Express x1 to x16 adapter accommodates low profile x2, x4, x8, x12 or x16 PCI Express cards, eliminating the cost and hassle of upgrading a PCIe card or

pcie x 16 slot Yes, a PCIe x4 card will function in a PCIe x16 slot The slot will simply use 4 of the 16 lanes available, and the card will work properly  7PCIe slots Up to300Wauxiliary power One PCIe x4 gen 3 Apple IO card Four PCIe x8 gen 4 Two single height Two double height Two PCIe x16 gen 4 Double