Mellanox made the HCAs (aka network cards) and Voltaire made the switches. Mellanox had their own drivers and their own MOFED (their incompatible fork of openfa

Mellanox made the HCAs (aka network cards) and Voltaire made the switches. Mellanox had their own drivers and their own MOFED (their incompatible fork of openfabrics upstream OFED with Mellanox specific enhancements).