Can I insert a PCIe x4 card into a PCIe x1 slot?

pcie 3 0 x1 slot   Dan pcie 40 gpu in 30 slot

1 x PCIe x16 slot 2 x PCIe x16 slots 1 x PCIe x1 slot In short, the specs page tells

According to PCIE Expresscard , a x1 card can be inserted into the x4, x8, and x16 connectors 15 This is referred to as up USB PCI Express Expansion Card, PCI-e X1 to 4 Ports USB (2 USB PCIe x1 to 3 x1 Slot PCI-e Express Switch Multiplier Hub GPU Riser Card

dishes to riches 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 Bandwidth of PCIe · PCIe x16 : 128 Gbits · PCIe x1 — open stack: 8 Gbits · PCIe x16 : 32 Gbits