FMC-GPIO-68SE is a conduction-cooled HPC FMC. It provides 68 Single-Ended GPIOs through a connector at the front bezel. The IOs are taken through level translator ICs which are auto-sensing and can covert from 1.8V to 3V, or 5V, and vice versa. In an alternative build option, some or all the IOs are pass through and not affected by the level translators. The front bezel has a Samtec ERF8-040-01-L-D-RA-L-TR connector. We use 6 Samtec RSP-122811-01 connectors as three differential pairs for transferring signals to the HB bank. These are useful for providing external-clock/ synchronization-signals.