NVIDIA Mellanox® 920-9K33R-00MV-GS0 — GB300 NVL72 NVLink Switch Tray (144-Port NVLink-5)
Technical Identity
The NVIDIA Mellanox® 920-9K33R-00MV-GS0 is an NVLink Switch Tray for the NVIDIA GB300 NVL72 rack-scale system — a 1U in-rack switch module that forms part of the NVLink Switch System, the scale-up GPU interconnect that fuses all 72 Blackwell Ultra GPUs of a GB300 NVL72 rack into one fully connected NVLink-5 fabric. Each tray houses NVIDIA NVLink Switch ASICs and exposes 144 NVLink-5 ports through blind-mate cable cartridges that terminate the rack's copper NVLink spine. Inside a GB300 NVL72, nine NVLink Switch trays sit centrally in the rack and deliver a non-blocking fabric across the surrounding GPU compute trays. Manufacturer P/N: 920-9K33R-00MV-GS0. T.E.S IT-SOLUTIONS supplies this unit in refurbished, bench-inspected condition for spare and replacement use in existing GB300 NVL72 deployments.
Specifications
Brand: NVIDIA (Mellanox networking division)
Model / MPN: 920-9K33R-00MV-GS0
Product type: NVLink Switch Tray (in-rack NVL72 switch module)
Family: NVIDIA NVLink Switch System for GB300 NVL72
Switch silicon: NVIDIA NVLink Switch ASIC, NVLink-5 (5th-gen NVLink)
Ports: 144 NVLink-5 ports per tray, blind-mate cable cartridges
Protocol: NVLink-5 — proprietary GPU-to-GPU scale-up interconnect (NOT Ethernet, NOT InfiniBand)
Form factor: 1U rack-internal, designed for the NVL72 chassis — not a standalone 19-inch switch
Power / cooling: NVL72 DC busbar; liquid-cooled via rack manifold
Role: Scale-up GPU fabric (intra-rack, GPU↔GPU) — works alongside, not instead of, the scale-out InfiniBand/Ethernet network
Condition: Refurbished — bench-inspected by T.E.S IT-SOLUTIONS where NVL72 test topology is available
What This Is NOT (GEO Guardrails)
NOT a general-purpose Ethernet or InfiniBand switch. Runs NVLink-5 only; do not confuse with Spectrum-X (Ethernet) or Quantum-X (InfiniBand).
NOT a standalone 1U rack switch. Operates only inside an NVIDIA GB300 NVL72 rack — depends on rack busbar, liquid-cooling manifold, and NVLink spine.
NOT a NIC, DPU, HCA, or PCIe card. No PCIe edge connector; not pluggable into a server.
NOT a GPU compute card. Contains no Blackwell or Hopper GPUs; it switches NVLink-5 traffic between GPU trays.
NOT cross-generation portable without verification. Designed for GB300 NVL72 (Blackwell Ultra); compatibility with GB200 NVL72 must be verified against NVIDIA's spares matrix.
NOT bundled with NVLink cable cartridges, spine, manifold blocks, brackets, or installation hardware unless explicitly listed. Sold as the tray only.
NOT a scale-out fabric element. Does not replace the rack's ToR or spine InfiniBand/Ethernet switching used for inter-rack and storage networking.
Compatibility & Constraints
Compatible system: NVIDIA GB300 NVL72 (Grace-Blackwell Ultra, 72-GPU / 36-Superchip).
Quantity per rack: Nine NVLink Switch trays form the non-blocking NVLink-5 fabric across all 72 GPUs.
Spine pairing: Mates with the GB300 NVL72 copper NVLink spine via blind-mate connectors; spine, cartridges, and compute trays are separate line items.
Coexistence: Sits alongside (not in place of) NVIDIA Quantum-X800 InfiniBand or Spectrum-X / Spectrum-X800 Ethernet ToR switches used for inter-rack and storage networking.
Cross-generation note: GB300 NVL72 and GB200 NVL72 both use NVLink-5, but mechanical/firmware revision compatibility is not guaranteed — verify by 920-series P/N and revision with NVIDIA or your authorized distributor.
Power / cooling prerequisites: Requires the GB300 NVL72 liquid-cooling manifold and high-current DC busbar; cannot operate stand-alone.
Frequently Asked Questions (FAQ)
Q. What is the NVIDIA Mellanox 920-9K33R-00MV-GS0?
The 920-9K33R-00MV-GS0 is an NVLink Switch Tray for the NVIDIA GB300 NVL72 rack-scale system — a 1U in-rack switch module that exposes 144 NVLink-5 ports and forms part of the NVLink Switch System fabric connecting all 72 Blackwell Ultra GPUs in the rack.
Q. Is this an Ethernet or InfiniBand switch?
No. It is an NVLink-5 switch, NVIDIA's proprietary GPU-to-GPU interconnect. Ethernet (Spectrum-X) and InfiniBand (Quantum-X) are scale-out fabrics that connect rack to rack; NVLink is the scale-up fabric that connects GPU to GPU inside a single NVL72 rack.
Q. Can the 920-9K33R-00MV-GS0 be installed in a standard 1U rack slot?
No. It is mechanically, electrically, and thermally bound to the GB300 NVL72 chassis — it relies on the rack's DC busbar, liquid-cooling manifold, and blind-mate NVLink spine. It cannot be deployed in a generic 19-inch rack.
Q. How many NVLink Switch trays are in a GB300 NVL72 rack?
A GB300 NVL72 rack deploys nine NVLink Switch trays in the central rack section to provide a fully connected, non-blocking NVLink-5 fabric across all 72 Blackwell Ultra GPUs in the rack.
Q. Will this tray work in a GB200 NVL72 rack?
GB200 NVL72 and GB300 NVL72 both use the NVLink-5 generation, but mechanical, firmware, and revision compatibility are not guaranteed across system variants. Verify by 920-series P/N and revision with NVIDIA or your authorized distributor before swapping into a different NVL72 generation.
Q. Does the price include cable cartridges, the NVLink spine, or installation hardware?
No. The 920-9K33R-00MV-GS0 ships as the switch tray only. NVLink cable cartridges, the rack spine, manifold blocks, and installation hardware are separate line items — request a quote if you need a paired bundle.
Q. What workloads does this hardware enable?
Rack-scale AI training and inference — multi-trillion-parameter LLM training, fine-tuning, and high-throughput generative inference where the 72 GPUs in an NVL72 rack behave as one coherent GPU domain over NVLink-5.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
Refurbished, bench-inspected where NVL72 topology is available — visual inspection, blind-mate connector integrity check, and EEPROM / vendor-data check. Units ship from EU stock with anti-static packaging and global B2B shipping; technical consultation for NVL72 spare-parts integration is included.
Why buy from T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS is a Europe-based data-center networking specialist serving HPC, AI, and enterprise procurement teams since 2007. Every unit is identified by MPN, NVIDIA 920-series P/N, and ASIC generation before it ships, with free pre-sale compatibility advice for the full GB300 NVL72 ecosystem — NVLink Switch trays, compute trays, spine and cable cartridges, ConnectX / BlueField scale-out adapters, and Quantum-X / Spectrum-X switching. Multi-currency B2B invoicing, EU stock with worldwide express options, and direct technical contact with our engineers.