Mellanox QM9790 Quantum-2 40-Port NDR 400Gb/s InfiniBand Switch

The Mellanox QM9790 provides centrally managed spine connectivity for very large InfiniBand fabrics in the data centre. As an Nvidia Quantum switch, it combines NDR scale with fabric-level control to simplify operations and support consistent, high-performance growth.

Mellanox QM9790 Quantum-2 40-Port NDR 400Gb/s InfiniBand Switch
Starting from: £15100.00 Ex. VAT
SKU QM9790 Categories , , Brand:
View all models in this series: NVIDIA InfiniBand Switches

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Mellanox QM9790 Switch Overview

As high-density compute estates expand, network fabrics have to carry heavier east-west traffic, stay predictable under load, and remain simple to govern as more clusters come under one operational model.

Centralised NDR Switching for Large Fabrics

The Mellanox QM9790 is an externally managed Quantum-2 NDR InfiniBand switch for very large fabrics that need 64-port density with centralised operational control. It suits AI, simulation, and shared production clusters where switch-level policy is managed from the fabric rather than at the device.

Built for Fabric-Level Operations

With 64×400G NDR ports, 51200 Gbps switching capacity, and MLNX-OS, the platform supports the throughput and administration model expected in tightly controlled environments. Hot-swappable PSUs help keep maintenance aligned with service windows and reduce disruption during routine hardware work.

Operational Control Across Dense Compute Environments

That combination gives infrastructure teams a practical way to standardise provisioning, monitoring, and lifecycle management across large estates. It also supports cleaner scaling when multiple workloads need to be treated as one fabric, without adding local management overhead.

Our team can help you assess where the Mellanox QM9790 fits in your fabric design and deployment plan.

Mellanox QM9790 Switch Key Features​

The Mellanox QM9790 is an InfiniBand switching platform for high-performance fabric environments, designed to provide high-bandwidth connectivity and a scalable networking foundation for demanding infrastructure deployments.

Fabric Performance at Scale

High-Density NDR Switching
The platform delivers 64×400G NDR ports, providing dense fabric connectivity for bandwidth-intensive InfiniBand environments.

Twin-Port OSFP Design
Its 32×OSFP twin-port configuration supports a compact high-speed port architecture for efficient fabric build-out.

Large Switching Capacity
The switch architecture provides 51200 Gbps of switching capacity to support high-throughput fabric operation.

InfiniBand Fabric Architecture
The system is built on an InfiniBand fabric model to support low-latency, high-performance interconnect design.

Operational Control for Fabrics

Purpose-Built Network Role
The QM9790 is positioned as a fabric switch for infrastructure that depends on controlled, high-bandwidth network interconnects.

Deployment Consistency
Its switching architecture supports standardized fabric design across new and refurbished variants of the same model.

Scalable Interconnect Planning
The port and capacity profile supports straightforward planning for expanding InfiniBand environments.

Speak to a Mellanox Networking Specialist

If you are designing a high-performance InfiniBand fabric, our team can help align port density, switching capacity, and deployment strategy to your infrastructure requirements.

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Mellanox QM9790 Switch Technical Specifications

Full specifications for this model are listed below.

Additional information

Product Family

NVIDIA Quantum
Product Series

QM9700
Operating System

Deployment

Data Centre
Switching Capacity (Gbps)

Target Organisation Size

Service Provider
Primary Use Case

Spine
Product Tier

Flagship
Network Architecture

InfiniBand Fabric
Access Ports

64
Access Port Architecture

QSFP56
Uplink Ports

None
Uplink Architecture

None
Total Ports

64
Maximum Port Speed

200G
Port Configuration

64×QSFP56
PoE

No
PoE Budget (W)

0, None
Stacking

Supported
Power Redundancy

Hot-swappable PSUs
Maximum VLANs

4096
Routing Capability

Dynamic

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Mellanox QM9790 Switch Deployment Scenarios

The Nvidia Mellanox QM9790 is a managed NDR switch for very large AI and HPC fabrics where central control matters as much as throughput. It fits estates that need dense 64-port interconnects, standard policy, and consistent operations across many racks.

Large Centralised Data Centre Fabrics

In hyperscale and enterprise data centres, the QM9790 suits clusters that have outgrown local switch administration. Teams use it to standardise policy, simplify lifecycle change, and keep fabric behaviour consistent across expanding AI estates.

Studio Render and Generative Media Clusters

Media teams running shared render farms or generative workflows need fast cluster communication and one operational view across multiple farms. The QM9790 helps centralise control, so production systems stay manageable when demand spikes and projects overlap.

Research and AI Compute in Healthcare

Healthcare research environments often need large AI or HPC clusters without weakening governance. The QM9790 supports high-bandwidth interconnects while giving IT tighter operational oversight, which is important when sensitive workloads must remain observable and controlled.

Controlled Quant and Simulation Platforms

Finance teams deploying simulation or AI clusters need low-friction scale, but also change control that fits risk processes. The QM9790 provides managed NDR fabric behaviour that helps operations stay centralised as compute estates expand.

Shared AI Development Platforms

For software development teams, the QM9790 is a strong fit where many users share production-scale training resources. It supports consistent provisioning and segmentation, reducing manual fabric work as projects move from test into larger training runs.

Planning a Mellanox QM9790 Deployment?

We can help design and deploy QM9790 fabrics for AI, HPC, render, research, and controlled development environments, with support for architecture planning, operational fit, and rollout across large estates.

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Tailored recommendations for your infrastructure

Below you’ll find alternative models, suitable software and services that pair with this solution – helping you to avoid compatibility issues, reduce support overhead and deploy with confidence.

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