How can you know if a PCIe slot is shared with another?

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PCIe slots come in different physical configurations: x1, x4, x8, x16, x32 The number after the x tells you how many lanes (how data travels to

Providing total bandwidth up to 250MBps from the PCIe x1 host controller card allows the computer to function as though the expansion chassis cards were  However, there is usually a cost increase incurred with higher lane counts PCIe Slot Differences Photo from 20050531pci-express-cards

situs 77 slot The number represents the number of lanes in the PCIe slot For example, a PCIe x1 slot provides one lane and transmits data at 1 bit per cycle  ok I feel like an absolute MORON! I had NO idea you can install a PCIE X1 card into the x4, x8, x16 PCIE slots on a Motherboard, I thought the slots only