Why would a PCIe x16 slot be limited to PCIe x1 card?

Why would a PCIe x16 slot be limited to PCIe x1 card? 1 x pcie 4 0 x16 slot The individual bandwidths that consumers can anticipate from the x1, x2, x4, x8, or x16 PCIe slots on their motherboards are doubled as a result 189 slot 1 PCIe x16 slot; 4 SATA3, 2 x ; Graphics Output Options: HDMI & Display ; 1 Rear USB Gen2x2 Type-C, 1 Rear USB Gen2

189 slot Specifications x 1 (4

1112 slot Common slot configurations include x1, x4, x8, and x16, which represent the number of data lanes available for communication A higher number of lanes generally A PCIe x1 slot has one lane and can move data at one bit per cycle A PCIe x2 slot has two lanes and can move data at two bits per cycle (and so