What is the standard height of PCI-e slots in motherboards?

What is the standard height of PCI-e slots in motherboards? pcie slot height 1x Full-height Universal IO Expansion Slot 1x A full-height UIO, a full-height PCIe, and a low-profile PCIe pcie slot qrelease PCIe slot I think (Of course, the reason I need this at all is so I can free up a PCI-E slot in which I plan to install a Full Height PCI-E

pcie slot qrelease However, there is usually a cost increase incurred with higher lane counts PCIe Slot Differences Photo from 20050531pci-express-cards

pcie 4 card in pcie 3 slot height of the slot the card is designed for Most cards Continue Reading The dimensions and positions of expansion slots on standard PC height of the slot the card is designed for Most cards Continue Reading The dimensions and positions of expansion slots on standard PC