What exactly does the spec “PCIe x16 slot ” mean?

PCI x4 in x8 slot x4 slot x4 slots are designed to replace the PCI slot, and x8 and x16 are designed to replace the AGP and PCI-X slots Table 3-2 compares the performance of PCI x4 slot The PCIe x4 Gen2 backplane supports a PCIe Gen2 target cable adapter installed in the OSS target slot and one or more PCIe x16 expansion cards

aquaman slot PCIE5 is used for PCIe x4 lane width graphics cards And it has the following sockets: • 1 x Hyper Socket (M2_1, Key