HP-branded InfiniBand FDR passive copper cable — the HP 670759-B23 is a 1.5-meter QSFP passive copper cable (DAC) rated for InfiniBand FDR at 56Gb/s. MPN: 670759-B23. This product IS a passive copper DAC cable for IB FDR connections; it is NOT an active fiber cable (AOC), NOT compatible with EDR (100Gb/s) InfiniBand switches, and NOT compatible with QSFP28 ports. OEM: HP (HPE). This is the 1.5m variant; the 1m variant is HP 670759-B22. Condition: refurbished.
Engineering Context
The 670759-B23 carries InfiniBand FDR signaling at 14.0625 Gb/s per lane across 4 lanes for an aggregate of 56Gb/s. At 1.5 meters and passive copper construction, it operates well within the passive copper reach budget for FDR IB. It provides microsecond-range latency with no active components and zero active power draw. The QSFP connector (not QSFP28) is keyed for the FDR generation of InfiniBand hardware. HP branded the 670759-B23 for use with HP ProLiant servers equipped with IB HCAs, and it is cross-compatible with standard Mellanox IB FDR QSFP ports.
Deployment & Use Cases
Designed for InfiniBand FDR fabric deployments connecting server HCAs to leaf switches within the same rack where 1m is insufficient. Used in HP ProLiant blade and rack server environments with FDR IB HCAs for MPI-based HPC workloads. Suitable for node-to-switch connections in Lustre storage networks and parallel compute clusters where 1.5m reach is required. Appropriate for VMware ESXi environments using IB FDR for RDMA-based shared storage connectivity. The 1.5m length fits dense rack configurations where cable management requires slightly more slack than 1m.
Technical Specifications
MPN: 670759-B23
OEM: HP (HPE)
Cable Type: Passive Copper (DAC)
InfiniBand Speed: 56Gb/s (FDR)
Lane Rate: 14.0625 Gb/s per lane (4 lanes)
Connectors: QSFP (both ends — not QSFP28)
Cable Length: 1.5 meters
Active Components: None (passive)
Power Draw: 0W active
Condition: Refurbished
Compatibility & Constraints
Compatible with QSFP FDR ports on HP ProLiant servers with IB HCAs, and with standard NVIDIA Mellanox FDR InfiniBand switches (SX6036, SX6012, SX6025). Compatible with ConnectX-3 and ConnectX-3 Pro HCAs with QSFP FDR ports. The 670759-B23 uses QSFP connectors and is NOT compatible with QSFP28 (EDR/HDR/100GbE) ports — different keying and electrical spec. NOT compatible with EDR (100Gb/s) IB switches. NOT compatible with QSFP+ 40GbE Ethernet ports. Length variant comparison: shorter = 670759-B22 (1m); longer variants in same HP family for 2m+ reach. FDR cables are not forward-compatible with EDR switches at FDR speed.
Why Choose T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS tests all passive copper cables for electrical continuity and QSFP connector integrity prior to dispatch. Lab-verified stock, 1–3 business day handling, global shipping. Technical consultation available for IB fabric cable planning. Visit tes-itsolutions.com.