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NVIDIA Spectrum-3 SN4700

CurrentNetwork1U fixed switch
NVIDIA Spectrum-3 SN47001U fixed switch32 ports12.8 Tbps

The NVIDIA Spectrum-3 SN4700 is a 1U hyperscale spine and leaf switch delivering 32 ports of 400GbE QSFP-DD. Providing 12.8 Tbps of bidirectional switching throughput powered by the Spectrum-3 ASIC with a 64 MB shared buffer, the SN4700 is engineered for AI/ML GPU training fabrics and hyperscale cloud backbones. Secondary market demand is strong as AI datacenters adopt 400G spine architectures to eliminate fabric oversubscription.

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Specifications

BrandNVIDIA
FamilySpectrum
Form factor1U fixed switch
ReleasedApr 2020
Ports32x 400GbE QSFP-DD ports (backward compatible with 100GbE QSFP28)
Switching capacity12.8 Tbps / 8.4 Bpps wire-speed forwarding performance
LatencyUnder 400 nanoseconds low cut-through latency
SiliconNVIDIA Spectrum-3 ASIC with RoCE v2 congestion management
CoolingHigh-efficiency redundant hot-swappable fans and power modules

Generations

Works together

How the NVIDIA Spectrum-3 SN4700 connects to servers, storage and the network: 4 ways, with the parts and products on each path.

iSCSI and NVMe/TCP over EthernetFile storage (NFS and SMB)Hyperconverged clusterGPU cluster fabric

iSCSI and NVMe/TCP over Ethernet

Keep the speed the same at all three points: a 25GbE server, a 25GbE switch port and a 25GbE array port. Mixed speeds work but the slowest link sets the pace.

Servers

Adapters for the server

Storage

Optics

iSCSI and NVMe/TCP over Ethernet: how it fits together

File storage (NFS and SMB)

Front-end ports face the clients; back-end ports (on scale-out systems) connect the nodes to each other and need their own switch pair.

Servers

Adapters for the server

Storage

Optics

File storage (NFS and SMB): how it fits together

Hyperconverged cluster

Plan at least two 25GbE ports per node to two switches; all-NVMe clusters often move to 100GbE.

HCI nodes

Adapters for the server

Optics

Hyperconverged cluster: how it fits together

GPU cluster fabric

InfiniBand adapters and switches must match the generation: HDR is 200Gb, NDR is 400Gb. VPI adapters such as ConnectX-6 and ConnectX-7 can run either InfiniBand or Ethernet.

Servers

GPUs

Adapters for the server

GPU cluster fabric: how it fits together

Plan and size it

Check compatibility with NVIDIA

Before you buy, confirm the exact configuration against the vendor's own lists: firmware levels, operating systems, adapters and optics that NVIDIA has tested with the NVIDIA Spectrum-3 SN4700.

Equivalent models from other brands

FAQ

Can the 400GbE ports on the SN4700 break out to 100GbE?

Yes, each QSFP-DD port can be split into 4x 100GbE or 2x 200GbE interfaces.

What operating systems are supported on the SN4700?

It supports NVIDIA Cumulus Linux, Onyx, and Microsoft SONiC.

Buying or selling Spectrum-3 SN4700?

New, refurbished or used. Tell us the quantity and condition and we connect you with a vetted reseller in your region, usually within one working day.

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Sources