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MSB7890-ES2F
Mellanox
The NVIDIA Mellanox MSB7890-ES2F (SB7890) is a 1U externally managed EDR 100Gb/s InfiniBand switch system built with Switch-IB 2 silicon. Designed for top-of-rack leaf connectivity and small-to-medium cluster buildouts, the device supports 36 QSFP28 ports with non-blocking full-duplex bandwidth per port. It operates across QDR, FDR10, FDR, and EDR InfiniBand data rates via auto-negotiation.
The SB7890 serves high-performance computing clusters, AI training racks, and storage fabric environments where consistent low-latency interconnect is required. Commercial users deploying GPU-dense servers rely on this switch class for MPI-based workloads and distributed storage access patterns.
Parameter | Value |
Model Number | MSB7890-ES2F |
Product Series | SB7890 |
Switch Silicon | Mellanox Switch-IB 2 |
InfiniBand Standard | EDR 100Gb/s (backward compatible with FDR, FDR10, QDR) |
Port Count | 36 |
Port Type | QSFP28 |
Aggregate Bidirectional Throughput | 7.2 Tb/s |
Port-to-Port Latency | 90 ns |
Management Mode | Externally managed (unmanaged stand-alone) |
Chassis Form Factor | 1U rack-mount |
Power Supplies | Dual AC PSU, redundant |
Airflow Direction | Power-to-Connector (P2C), forward |
Encoding | 64b/66b |
Per-Lane Signaling Rate | 25 Gb/s |
Brand | NVIDIA Mellanox |
At the core of the SB7890 sits the Mellanox Switch-IB 2 InfiniBand switch device. The chip implements 64b/66b encoding at 25 Gb/s per lane, yielding 100 Gb/s per 4-lane QSFP28 port. Collective operation acceleration and adaptive routing logic are integrated into the silicon to reduce fabric congestion under heavy load.
All 36 ports use the QSFP28 form factor and accept EDR InfiniBand optical or copper cables. The switch auto-negotiates link speed between QDR, FDR10, FDR, and EDR modes when connected to legacy equipment. Dual redundant AC power supplies maintain uptime during single-feed failures, and the P2C airflow design aligns with standard hot-aisle/cold-aisle rack layouts.
Enterprise customers building scale-out HPC or AI clusters commonly place the SB7890 as a leaf switch at the top of each server rack. Its 36-port density matches typical 1U-to-2U GPU server counts per rack, allowing full-mesh GPU-to-GPU communication without oversubscription on the leaf layer.
The SB7890 interoperates with NVIDIA Mellanox ConnectX-5 and newer InfiniBand host channel adapters. Mixed-rate fabrics are supported through auto-negotiation, so organizations with existing FDR or QDR equipment can integrate the switch during phased upgrade projects. Standard 1U rack height and included rail kits fit most EIA-310 19-inch server cabinets.
No. The MSB7890-ES2F operates at EDR 100Gb/s per port. HDR 200Gb/s capability is found in the NVIDIA Quantum QM8700 switch series, which uses QSFP56 connectors instead of QSFP28.
With 36 available QSFP28 ports, a single SB7890 can connect up to 36 server nodes when used as a dedicated leaf switch, reserving no ports for uplink in a flat fabric topology.
Yes. The MSB7890-ES2F includes a standard 19-inch rack-mount rail kit for installation in EIA-310 compliant server cabinets.
