PCIe cards generally come in two height profiles. Height is measured from the bottom of the gold edge connector to the top edge of the card.
There are several PCIe card form factors, each with its own dimensions: pcie card dimensions
The dimensions of a PCIe (Peripheral Component Interconnect Express) card are standardized by the . While the width of the card is generally fixed, the length and height vary depending on the form factor and the specific version of the standard. PCIe cards generally come in two height profiles
PCIe cards use different keying and connectors to prevent incorrect installation: pcie card dimensions