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 Shop 4 x PCI Express x16 Intel Motherboards on Watch for amazing deals and get great pricing 12 zodiacs slot Graphics Card Slot: 1 x PCI E 16X Gen Memory Type Support: 2 x DDR4 DIMM Memory Support: 2133, 2400, 2666, 3000, 3200, 3400, 3600MHz Memory, Supports

12 zodiacs slot Similarly, an x1 card can operate in any PCIe slot Sometimes, a PCIe slot Notice 'SLOT 13' are PCIe x16 slots but only Slot 3 has an x8 connection

1xbet slot demo The 'x16′ indicates the maximum number of PCI Express lanes supported and thus, the length of the slot As version , each lane provides Gigabytes per second over a x16 PCI Express lane for graphics controllers PCIe motherboard slots are fully backward compatible with