Can You Plug a PCIe x1 Into an x16 Slot?

They move data on and off the motherboard at up to 250 MBps in each direction at once The PCIe x16 slot that replaces the AGP graphics-card

Other PCIE slots are x16 physically, but they all operate as x1 electrically With that said, if I put my HBA to the x1 slot, what

pcie slot size PCI Express X1 to X16 Low Profile Slot Extension Adapter - PCIe x1 to x16 Adapter - PCIe x1 to PCIe x16 slot adapter

pcie slot configuration gen1 gen2 gen3 Is the card installed in the top pci-e x16 slot? Do you have any other hardware plugged into other pci-e slots in the motherboard?