SBM-IBS-Q3616*/ SBM-IBS-Q3616M* and SBM-IBS-Q3618*/ SBM-IBS-Q3618M* Switch Chip Mellanox InfiniScale IV Internal Ports Twenty (SBM-IBS-Q3616/M) Eighteen (SBM-IBS-Q3618/M) External Uplink Ports Sixteen 4X QDR with QSFP connectors (SBM-IBS-Q3616/M) Eighteen 4X QDR with QSFP connectors (SBM-IBS-Q3618/M) Bandwidth 4x QDR (40-Gbps) non-blocking architecture 2.88Tbps total switch bandwidth (36-Port)