NVIDIA Mellanox SN2740 - 32 x QSFP28 100GbE Spectrum Open Ethernet Switch
The NVIDIA Mellanox SN2740 is a fixed-conf...
NVIDIA Mellanox SN2740 – 32 x QSFP28 100GbE Spectrum Open Ethernet Switch
The NVIDIA Mellanox SN2740 is a fixed-configuration Open Ethernet switch built on the NVIDIA Spectrum ASIC, providing 32 x QSFP28 100GbE in a 1U form factor. NVIDIA’s current documentation publishes the ordering configuration for this model; where a specification is not published, this page omits it rather than estimating. This page covers the SN2740 model family; each factory part number has its own product page linked in the variant list below.
Key Specifications
Ports: 32 x QSFP28 100GbE
Form factor: 1U
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: NVIDIA Onyx, ONIE/SONiC, ONIE – note: software licensing, subscription and support entitlements are not conveyed with refurbished hardware
SN2740 Part Numbers and Variants
SN2740 systems circulate on the secondary market under Mellanox-format OPNs (MSN…). Variants differ by airflow direction, factory software designation and port speed class. Match airflow to your aisle layout and confirm optics/cables separately.
MSN2740-CB2R1 – NVIDIA Onyx (license not included), C2P (port-side intake, rear exhaust)
MSN2740-CB2R1OS – ONIE/SONiC (license not included), C2P (port-side intake, rear exhaust)
MSN2740-CB2F1O – ONIE (license not included), P2C (rear intake, port-side exhaust)
MSN2740-CB2F1 – NVIDIA Onyx (license not included), P2C (rear intake, port-side exhaust)
MSN2740-CB2F1OS – ONIE/SONiC (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.
Spectrum Architecture
SN2740 systems are built on the NVIDIA Spectrum (Spectrum-1) 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
Leaf-spine data center fabrics: wire-speed L2/L3 with the fully shared buffer absorbing many-to-one bursts across all ports
Storage and hyperconverged backends: RoCE-optimized forwarding for NVMe-oF, vSAN and scale-out storage traffic
High-density aggregation: breakout support concentrates racks of 25/10GbE servers into a compact footprint
SN2740 Price and Availability
Refurbished SN2740 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 SN2740 pricing, request a quote – a BrightStar specialist will respond with availability, condition and warranty terms.
Frequently Asked Questions
How much does a used NVIDIA Mellanox SN2740 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 SN2740 run?
Factory builds of the SN2740 carry the following designations: NVIDIA Onyx, ONIE/SONiC, ONIE. 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 SN2740?
The SN2740 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 SN2740 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 SN2000 Series Products
Browse all SN2740 variants and the rest of the lineup on the SN2000 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.
