What is PCIe x1 slot used for? - STC-Cable

pciex1_1 slot   Dan diamond queen slot machine

The web summary says that PCIEX1_2 slot, PCIEX1_1 slot and PCIEX16_2 slot share bandwidth but nothing beyond that, and the manual says nothing

PCIe cards can always operate in PCIe slots with the same or more lanes than the card For example, an x8 card can operate in a slot with x8, x16, or x32 lanes  1 x PCI Express x16 slot, running at x4 * The PCIEX4 slot shares bandwidth with the PCIEX1_123 slots The PCIEX1_123 slots will

evil goblins xbomb slot PCIe slots and cards A PCIe or PCI express slot is the point of connection between your PC's “peripheral components” and the motherboard  Not sure why they didn't just link PCIEX1_1 to PCIEX4 as that slot usually becomes unusable due to the GPU also, i can't seem to find any