NVIDIA Quantum-2 InfiniBand Switch
50 GB/s
Fields
id
interconnect/nic-quantum2-switchKind
infiniband
Version
Quantum-2 (7th generation InfiniBand switch)
Bandwidth (GB/s, per link, unidirectional)
50
Bandwidth basis
PER LANE, PER DIRECTION. Each NDR 400Gb/s port = 50 GB/s per direction. Switch provides 64 NDR ports or 128 NDR200 ports.
Link count
64
Topology
Fat-tree, Dragonfly+, multi-dimensional torus. 1U fixed-configuration switch.
Scale-up
no
Scale-out
yes
Switching
Non-blocking switching capacity of 51.2 Tb/s bidirectional. 66.5 billion packets per second. SHARPv3 in-network reduction (32x higher AI acceleration power vs previous generation, vendor claim). MPI tag matching and MPI AlltoAll hardware acceleration. Adaptive routing, congestion control, QoS, self-healing networking.
notes
Quantum-2 is the switch silicon that builds the InfiniBand fabric. Key specs from datasheet: 64 400Gb/s ports on 32 OSFP connectors (split to 128 200Gb/s), 51.2 Tb/s bidirectional throughput, 66.5B pps. SHARPv3 enables in-network reduction for collectives. The switch is where SHARP operates - it reduces all-reduce traffic inside the switch rather than at the endpoints. Over one million 400Gb/s nodes in a 3-hop Dragonfly+ topology (vendor claim). Backward compatible with HDR/EDR/100Gb/s via splitter cables.
way
each
Notes
Quantum-2 is the switch silicon that builds the InfiniBand fabric. Key specs from datasheet: 64 400Gb/s ports on 32 OSFP connectors (split to 128 200Gb/s), 51.2 Tb/s bidirectional throughput, 66.5B pps. SHARPv3 enables in-network reduction for collectives. The switch is where SHARP operates - it reduces all-reduce traffic inside the switch rather than at the endpoints. Over one million 400Gb/s nodes in a 3-hop Dragonfly+ topology (vendor claim). Backward compatible with HDR/EDR/100Gb/s via splitter cables.
Cross-references
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