As I am working with more High end FPGA boards. I need more different type of peripheral pugged into my FPGA board with FMC connector. This board is going to about Why and how i designed FMC HPC PCIe M.2 carrier adapter card so that You can Plug NVMe SSD Drive or any other PCIe Peripheral in M.2 Form factor.  As case with most modern FPGA board. They come with High density high speed expansion connector. Out of which FMC connectors are most common. FMC Connectors also  have few types, There FMC HPC connector which has all the pins of HPC connector , While there is a FMC LPC connector which has only a subset of HPC connector. Both FMC HPC and LPC connectors are basically same in terms of mechanical dimensions, They both fit into one another. Its just LPC has few electrical pins. The there is also a even bigger connector even with more pins called Vita 57.4 FMC+ , it is mostly Common with very expensive high end boards.