PCI-e x16 vs PCI-e x32 bus

That will work for old cards, but it can't go back to PCIe The riser slot on the motherboard x32? so I tried to Google around From

x32 The number represents the number of lanes in the PCIe slot For example, a PCIe x1 slot provides one lane and transmits data at 1 bit

pcie m2 slot Multiple lanes can be grouped together into x1 , x2, x4, x8, x12, x16, and x32 links to increase bandwidth to the slot For example, a

pcie slot length x32, where the number following 'x' represents how many channels the PCIe slot has A PCIe x1 slot