What is PCIe x4 Slot

Yes, you can plug into 16x slot, but off course it will run in 4x speed Some motherboard even let you plug 4x card into 1x

The number of lanes that a PCIe device supports is typically expressed like “x4” for 4 lanes, “x8” for 8 lanes, and so on x1, x2, x4, x8, x16 PCIe Gen 3

pciex4 slot В PCI Express x16 можно вставить видеокарту, а в PCI Express x1 — совместимую плату расширения Например, звуковую карту, тюнер, карту

pcie 30 x4 slot PCIe x4 speed vs x8 speed vs x16 speed Tested with rtx 3060 ti