AdvancedTCA (ATCA) is, at its core, a fabric agnostic architecture, and one of the fabrics defined early on was InfiniBand via the ATCA 3.2 sub specification. As ATCA systems move towards production, it is likely that the majority of these systems are ATCA 3.1 or Ethernet based systems, but there are limitations in this kind of deployment. Others propose Advanced Switching as the “King of All Fabrics”, but truly there may be no king of fabrics in ATCA. Time to market, bandwidth, latency, and even system level costs are some areas in which InfiniBand may have a surprisingly good fit for ATCA.