What are the top uses of PCIe x1 Slots?

In ASUS 「PCIe x16 Slots - 4」 - Motherboards Components , you out of 5 stars Intel LGA 1151 ATX motherboard with AI Overclocking, quad-GPU

The most common are PCIe x16 slots, which many modern-day GPUs are slotted into Keep in mind there are generations to PCIe, each doubling in

pcie2 slot Every motherboard has a number of PCIe slots used to add GPUs, SSDs, and RAID card etc As mentioned above, a single PCIe slot can have x1, x2,

pcie training error slot 1 PCI Express is a computer expansion card standard and is used most often for video cards PCIe is intended as a replacement to PCI