PCIe X1 slot in motherboard explained in Hindi

I recently got an LSI 2308, and have not had a chance to test it yet My motherboard only has one PCIE x16 slot ,

slot x1 228022110 NVMe SSD slot x1 228022110 NVMe SSD slot x1 Memory expansion 1* PCIe x16

x1 pcie slot The spec for X1 PCI-e states that the max is 25W I would think that the cards intended for an X1 slot should conform to that standard YMMV of

x16 slot IP4X-2D1X is a PCI Express x4 to Four PCIe x1 slots docking system