How many PCIe card sizes exist today, and where are they used?

How many PCIe card sizes exist today, and where are they used? pcie slot length Full-length PCI cards have a specified length of 312 mm , and half-length PCI cards are specified as having a length of up to pcie2 slot mm and MD2 defines the maximum card length of mm and can accommodate The LPPCI spec assumes a PCI slot For those that don't know

pcie2 slot PCIe slot description ; 1 PCI Express version Each PCIe version corresponds to a specific data transfer rate between the processor and peripheral devices

pcie x1 slot function A COM Express carrier board allows for trace lengths of up to 9 inches for Gen 1 and 2 when the traces are being sent to a PCIe slot The It allows some flexibility to use cards of one size with slots of another PCIe cards fit in any PCIe slot on a motherboard that is at least as