NVIDIA Quantum-2 QM9790 NDR 400G Unmanaged InfiniBand Switch
Externally managed NDR 400G spine for large UFM-orchestrated GPU fabrics.
We help you choose, configure, and deliver the right system — no obligation.
Configuration at a Glance
Tailored per engagement. Full technical overview below.
Overview
The Quantum-2 QM9790 is a 1U externally managed NDR InfiniBand switch with 64 ports of 400Gb/s on 32 OSFP cages, designed for large fat-tree fabrics orchestrated by NVIDIA Unified Fabric Manager. Nexus Compute specifies, configures, and validates each QM9790 with the appropriate airflow and firmware, delivered warranty-backed through NVIDIA-authorized channels.
Who This Solution Is For
Business Benefits
Centralized fabric control
External UFM management delivers unified provisioning, telemetry, and predictive maintenance across the entire fabric.
Linear scale-out
Non-blocking leaf-spine topologies expand without re-architecting as the cluster grows.
Sourced and tested
Each switch is configured, validated, and supplied through authorized channels with full warranty coverage.
Typical Business Use Cases
Spine tier of large fat-tree GPU fabrics
UFM-managed multi-rack training clusters
Lossless backbone for distributed training
Telemetry-rich production AI infrastructure
Industry Applications
Technical Overview
Powered by the NVIDIA Quantum-2 ASIC, the QM9790 offers 64 NDR 400Gb/s ports on 32 OSFP connectors with 51.2 Tb/s of bidirectional throughput and SHARPv3 in-network reductions. As an externally managed switch it integrates with NVIDIA UFM for centralized routing, congestion control, and fabric-wide health monitoring.
| Switch ASIC | NVIDIA Quantum-2 |
| Ports | 64x NDR 400Gb/s (32x OSFP), to 128x NDR200 |
| Aggregate Throughput | 51.2 Tb/s bidirectional |
| Management | Externally managed via NVIDIA UFM |
| In-Network Computing | SHARPv3 collective acceleration |
| Adaptive Routing | Hardware adaptive routing and congestion control |
| Form Factor | 1U rack-mount |
| Power / Airflow | Dual hot-swap PSUs, P2C or C2P airflow option |
| Warranty | Manufacturer-backed via authorized channels |
Specifications are indicative and configured to each engagement. Request a quote for a configuration tailored to your requirements.
Warranty, Support & Fulfillment
Every system ships from an authorized channel, configured and tested, with the documentation enterprise buyers need — backed by warranty and a dedicated account team.
Enterprise Warranty
Full manufacturer warranty with optional on-site, next-business-day support and extended coverage.
Authorized Channel
Sourced through Tier-1 distribution and OEM partners — never grey market. Asset & warranty records included.
Lead Time & Deployment
48-hour quotes, then configured, burn-in tested, and delivered on a committed schedule.
Nationwide Fulfillment
Coordinated logistics, rack-and-stack, and delivery wherever your infrastructure lives.
Frequently Asked Questions
Why choose the unmanaged QM9790 over the managed QM9700?
The QM9790 relies on external NVIDIA UFM rather than an on-board subnet manager, which is the preferred model once a fabric grows beyond a single-switch domain and needs fabric-wide orchestration and telemetry.
Does the QM9790 require NVIDIA UFM?
Yes, an external subnet manager such as NVIDIA UFM is required; we scope the UFM deployment and licensing alongside the switch order.
Can QM9790 spines and QM9700 leaves mix in one fabric?
Yes, both use the same Quantum-2 NDR platform and interoperate in a fat-tree; we design the tiering to your node count and oversubscription targets.
Hardware Assistance
Configure the NVIDIA Quantum-2 QM9790 NDR 400G Unmanaged InfiniBand Switch with Nexus Compute
Tell us your requirements and a hardware specialist will help you specify, configure, and quote the right system — typically within two business days. No obligation.