What's the bandwidth and form factor for PCIe x1 x4 x8 and x16?

Can someone explain me the PCI-E slot variations & sizes of pcie slot size PCIe expansion slot definitions ; 1 PCIe FlexibleLOM HL, FH · FlexibleLOM x16 x8 16, 8, 4, 1 ; 2 PCIe HL, HH · x8, 8, 4, 1 pcie slot dimensions 20x full-size card slots · 4x PCIe x16 Gen from CPU · PCIe x16 Gen to each slot · Active air flow from edge to bracket · Power budget:

pcie slot splitter A PCIe x2 slot has two lanes and can move data at two bits per cycle PCIe slot sizes (Image credit: Erwin MulialimWikimedia