Will a wifi card fit into a pci-e x16 slot?

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I thought PCIe was superceding PCIX But I have 2 PCIe x 1 slots on my motherboard, 3 ordinary PCI slots and one which is

In ASUS 「PCIe x16 Slots - 7」 PCIe x16 is your 16-lane PCI Express slot, or at least your largestlongest PCI Express slot It is the most high-bandwidth, high-performance expansion slot

slot machine echtgeld The Matrox C900 PCIe x16 graphic card powers nine displays from a single board to easily build 3x3 video walls P690 Plus LP PCI Matrox P690 Plus LP PCI - Hello, we need to connect another device through the pcie x16 slot of AGX Orin, and the other device can start normally only after AGX Orin