Is a MacPro3,1 x16 slot PCIe or ?

Is a MacPro3,1 x16 slot PCIe or ? pcie x16 expansion slot PCIe links that use fewer lanes to use the same interface as PCIe links that use more lanes For example, a PCIe x8 card could plug into a PCIe x16 slot pcie slot for gpu PCIe expansion slots, including x4, x8, and x16 PCIe slots There are various peripheral cards you can use with PCIe x1 expansion slots

pcie slot for gpu Figure shows a motherboard with two x1 PCIe, two x16 PCIe, and three PCI expansion slots Notice that the PCIe x16 slot has a retention

pcie slot length 1 x PCI Express x16 slot, supporting PCIe and running at x16 * The PCIEX16 slot shares bandwidth with the M2C_CPU connector  TPM Expansion Slots Internal Mini PCIe, 2x Mini-PCIe Internal , 1x for NVME SSD Support PCIe Slot, Yes PCIe Expansion Details, PCIe x16 Dual