NVIDIA SN5400 - 64 x QSFP56-DD 400GbE + 2 x SFP28 Spectrum-4 Open Ethernet Switch
The NVIDIA SN5400 is a fixed-confi...
NVIDIA SN5400 – 64 x QSFP56-DD 400GbE + 2 x SFP28 Spectrum-4 Open Ethernet Switch
The NVIDIA SN5400 is a fixed-configuration Open Ethernet switch built on the NVIDIA Spectrum-4 ASIC, providing 64 x QSFP56-DD 400GbE + 2 x SFP28 in a 2U form factor. It delivers 25.6 Tbps of switching throughput and processes up to 33.3 Bpps, backed by a 160 MB fully shared packet buffer. This page covers the SN5400 model family; each factory part number has its own product page linked in the variant list below.
Key Specifications
Ports: 64 x QSFP56-DD 400GbE + 2 x SFP28
Throughput: 25.6 Tbps
Packet rate: 33.3 Bpps
Packet buffer: 160 MB, fully shared across all ports
Form factor: 2U, 3.46 x 17.2 x 28.3 in (88 x 438 x 720 mm), 23.5 kg (51.8 lbs)
Power supplies: Hot-swappable AC PSUs (200-264V input)
Typical power: 670 W
Airflow options: C2P (port-side intake, rear exhaust) and P2C (rear intake, port-side exhaust) – see the variant list; all FRUs in one chassis must share the same direction
Factory software designations: Cumulus Linux – note: software licensing, subscription and support entitlements are not conveyed with refurbished hardware
SN5400 Part Numbers and Variants
SN5400 systems use NVIDIA-format part numbers (920-…). Variants differ by airflow direction, power architecture and factory software designation. Match airflow to your aisle layout and power input to your facility distribution.
920-9N42C-00RB-7C0 – Cumulus Linux (license not included), C2P (port-side intake, rear exhaust)
920-9N42C-00FB-7C0 – Cumulus Linux (license not included), P2C (rear intake, port-side exhaust)
Other factory builds circulate on the secondary market. If you need a specific OPN that is not listed here, request a quote and we will source it.
Port Flexibility and Breakout
400GbE ports split down to 2 x 200GbE or 4 x 100GbE for high-radix fabrics. Actual modes depend on the installed network OS version and transceivers.
Spectrum-4 Architecture
SN5400 systems are built on the NVIDIA Spectrum-4 switching ASIC with a fully shared, monolithic packet buffer – every port can draw on the entire buffer, which absorbs microbursts and many-to-one incast far better than segmented-buffer designs in the same class. The platform supports RoCE (RDMA over Converged Ethernet) for storage and AI east-west traffic, rich telemetry with NVIDIA What Just Happened (WJH) hardware-level visibility, and the Open Ethernet model: the same hardware runs multiple network operating systems, so the fabric is never locked to one vendor stack.
Deployment Scenarios
400GbE spine and super-spine: wire-speed 400GbE with the Spectrum fully shared buffer
AI and accelerated computing fabrics: RoCE and adaptive routing capabilities for GPU cluster east-west traffic
Data center interconnect: deep-buffered high-speed handoff between fabric pods
SN5400 Price and Availability
Refurbished SN5400 systems are typically quoted per project: airflow variant, software designation, optics and quantity all move the number. Refurbished units price well below new list. For current SN5400 pricing, request a quote – a BrightStar specialist will respond with availability, condition and warranty terms.
Frequently Asked Questions
How much does a used NVIDIA SN5400 cost?
Pricing depends on the exact OPN, airflow variant, condition and quantity, and secondary-market supply moves week to week. Request a quote for current refurbished pricing – it is typically well below new list for equivalent hardware.
What software does the SN5400 run?
Factory builds of the SN5400 carry the following designations: Cumulus Linux. As with all refurbished hardware, software licensing, subscription and support entitlements are not conveyed with refurbished hardware – units are tested on original-spec firmware, factory reset, and configuration wiped. Confirm any OS licensing or support requirements with NVIDIA for your production environment.
What airflow directions are available for the SN5400?
The SN5400 is available as C2P (connector-to-power): air intake at the connector (port) side, exhaust at the power/fan (rear) side – red FRU handles or dots; and as P2C (power-to-connector): air intake at the power/fan (rear) side, exhaust at the connector (port) side – blue FRU handles or dots. All FRUs in one chassis must share the same airflow direction. Note that NVIDIA’s F/R lettering does not map to other vendors’ conventions – always confirm with the intake/exhaust wording on the variant page.
Is a refurbished SN5400 tested before shipping?
Yes. BrightStar Systems inspects and tests every unit on original-spec firmware, performs a factory reset and configuration wipe, and backs it with warranty (1 year end-user / 90 days reseller).
Related NVIDIA SN5000 Series Products
Browse all SN5400 variants and the rest of the lineup on the SN5000 Series page or the NVIDIA Switches category page.
Refurbished by BrightStar Systems
BrightStar Systems supplies professionally tested refurbished NVIDIA and Mellanox networking hardware. Every unit is inspected, tested on original-spec firmware, factory reset, and configuration wiped before shipment, and backed by our standard warranty. Data center switching of this class is typically project-priced – request a quote for current availability and pricing.
