What are the top uses of PCIe x1 Slots?

We have PCI Slot Computers available with 1x, 2x, 4x, 6x, and 7x PCI slots in mini-tower, mid-tower chassis and 4U Rack mountable chassis

1 Peripheral Component Interconnect : PCI is a computer bus to connect the hardware devices in a computer system · 2 Peripheral

pciex16 slot We have PCI Slot Computers available with 1x, 2x, 4x, 6x, and 7x PCI slots in mini-tower, mid-tower chassis and 4U Rack mountable chassis

pcie slot size 1 8+8 Solid Pin CPU Power Connector ; 2 Twin 16+2+2 Digital VRM Design ; 3 Advanced Thermal Design ; 4 Design Ready for PCI Express ; 5 EZ-Latch