Buy NVIDIA Mellanox compatible 800G and 400G OSFP transceivers

Flux IT Hardware offers high-performance NVIDIA Mellanox compatible 800G and 400G OSFP transceivers. Engineered for ultra-low latency and high bandwidth, they ensure seamless compatibility with NVIDIA Quantum-2 InfiniBand and Spectrum-4 Ethernet platforms, ideal for HPC, AI clusters, and modern data centres, supporting AI/ML workloads from small to large-scale deployments.

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Competitive Pricing

We aim to offer the best market prices on all 400G and 800G OSFP’s first time

Wide Variety

We sell  compatible OSFP for a wide range of manufacturers – Nvidia, Arista, Cisco, Mellanox and many more

Fast Response

Get a fast quote for all your hardware needs, with next and same-day UK delivery

Peace of Mind

All our OSFPs are fully tested and covered by a 2-year warranty

Environment

Save money by buying refurbished IT parts and protect the environment at the same time

Next-Gen OSFP Modules for 400G/800G Networks and AI Infrastructure

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A Member of the Flux IT team will get back to you within the next 24 working hours with a valuation. Should you have any questions, call us on 03330 048885.

Power AI and HPC with High-Speed Connectivity – Buy 800G/400G Optics Today.

For AI clusters, HPC environments, and next-gen data centres, speed and reliability are non-negotiable. At Flux IT Hardware, we supply enterprise-grade 800G and 400G optical transceivers designed to handle the high-throughput demands of modern infrastructure.

Our modules support leading standards like QSFP-DD and OSFP, ensuring seamless integration with platforms including NVIDIA, Cisco, Juniper, and Arista. Whether you’re deploying for deep learning, real-time inference, or massive data processing, our optics deliver low-latency, high-bandwidth performance you can trust.

We stock key variants such as CWDM8, FR4, and SR8, all thoroughly tested in live environments for plug-and-play deployment. Backed by expert support, fast shipping across the UK and EU, and competitive pricing, Flux IT is your go-to partner for scaling mission-critical networks.

Upgrade your infrastructure with confidence—future-ready 800G/400G optics are just a call away.

Optimised for performance. Delivered with precision. Powered by Flux IT.

Let’s get started – Get in touch for a happy quote. Tell us your requirements via the quick online form.

Need answers quickly? No problem, speak to a real IT hardware specialist on  03330 0488852

800G/400G usage in HPC, AI Clusters, and Data Centres

Our transceivers are designed to power InfiniBand network solutions for AI/ML applications, delivering the performance and scalability needed for modern workloads.

Small-Scale InfiniBand Clusters: Multimode Solutions

  • Best for: Intra-rack or row-level connectivity in compact HPC setups or small AI clusters.
  • Why Multimode?: Cost-effective for short distances (up to 50m), ideal for GPU-to-GPU communication in NVIDIA DGX H100 systems.

Recommended Products:

→ 800G 2xSR4/SR8 and 400G SR4 transceivers for high-density, low-latency links.

→ 800G/400G DAC cables for ultra-low latency, power-efficient connections within racks.

Use Case Example: A small-scale AI training cluster using Quantum-2 switches and ConnectX-7 adapters, where multimode transceivers enable fast, reliable GPU communication for iterative model training.

Mid-to-Large AI Clusters: Single-Mode + DAC Cable Solutions

  • Best for: Inter-rack or data centre-wide connectivity in large-scale AI/ML deployments or hyperscale cloud infrastructures.
  • Why Single-Mode?: Supports longer distances (up to 2km) for connecting distributed switches, adapters, and DPUs across expansive clusters.
  • Why DAC?: Provides low-cost, low-latency options for short-range, high-density switch-to-switch or switch-to-host links.

Recommended Products:

→ 800G 2xFR4/DR8 and 400G FR4/DR4 transceivers for long-reach, high-bandwidth connectivity.

→ 800G/400G DAC and breakout DAC cables for flexible, high-speed intra-rack or inter-rack links.

Use Case Example: A large-scale AI supercomputing cluster for LLM training, using Quantum-2 switches and single-mode transceivers to link multiple DGX H100 systems across a data centre, with DAC cables for high-density switch-to-switch connections.

Our 800G & 400G OSFP Transceiver Portfolio

Flux IT Hardware offers a comprehensive range of NVIDIA Mellanox compatible OSFP transceivers, designed to support both InfiniBand and Ethernet protocols. Our transceivers are available in single-mode and multimode fibre options, as well as passive and active copper DAC cables, catering to various distances and applications.

800G-Transceivers-Infiniband-Network

800G OSFP Transceivers

800G OSFP Transceivers

 

Reach: Up to 30m (OM3) or 50m (OM4)
Connector: Dual MPO-12/APC
Use Case: Ideal for short-reach connections within racks or rows in small-scale InfiniBand clusters.
Key Features: Finned-top design for air-cooled Quantum-2 switches, supports 800G-to-800G switch-to-switch or 800G-to-two 400G links to ConnectX-7 adapters.
SKU: FLX-OSFP-800G-2SR4SR8-MM850

Twin-Port 2xFR4/FR8 (Single-Mode, 1310nm)

Reach: Up to 30m (OM3) or 50m (OM4)
Connector: Dual MPO-12/APC
Use Case: Ideal for short-reach connections within racks or rows in small-scale InfiniBand clusters.
Key Features: Finned-top design for air-cooled Quantum-2 switches, supports 800G-to-800G switch-to-switch or 800G-to-two 400G links to ConnectX-7 adapters.
SKU: FLX-OSFP-800G-2SR4SR8-MM850

Twin-Port 2xDR4/DR8 (Single-Mode, 1310nm)

Reach: Up to 100m (DR4) or 500m (DR8)
Connector: Dual MPO-12/APC
Use Case: Suited for data centre reach in mid-to-large AI clusters, linking switches to ConnectX-7 or BlueField-3 DPUs.
Key Features: Supports 64 ports of 400G in a 32-OSFP cage, ideal for high-density deployments.
SKU: FLX-OSFP-800G-2DR4DR8-SM1310

400G OSFP Transceivers

SR4 (Multimode, 850nm)

Reach: Up to 30m (OM3) or 50m (OM4)
Connector: Single MPO-12/APC
Use Case: Cost-effective for short-reach, high-speed connections in small-scale InfiniBand clusters.
Key Features: Flat-top design for compact NIC ports, compatible with 800G switches for adaptive 200G/400G links.
SKU: FLX-OSFP-400G-TSR4-MM850

DR4 (Single-Mode, 1310nm)

Reach: Up to 500m
Connector: Single MPO-12/APC
Use Case: Optimized for mid-range data centre connectivity in AI/ML clusters.
Key Features: High compatibility with OSFP NICs, supports 800G-to-4x200G configurations.
SKU: FLX-OSFP-400G-DR4-SM1310

FR4 (Single-Mode, 1310nm)

Reach: Up to 2km
Connector: Duplex LC
Use Case: Long-distance connectivity for large-scale AI clusters and hyperscale data centres.
Key Features: Ensures stable, high-quality signal transmission for demanding workloads.
SKU: FLX-OSFP-400G-FR4-SM1310

DAC Cable Solutions

800G Twin-Port OSFP DAC

(Passive Copper)(Passive Copper)

Reach: Up to 3m
Use Case: Lowest-cost, near-zero power solution for switch-to-switch or switch-to-DGX H100 links in small-scale clusters.
Key Features: Finned-top to finned-top or finned-top to flat-top configurations, supports 2x400G.
Lengths: 0.5m, 1m, 1.5m, 2m, and 3m.

400G OSFP DAC

(Passive Copper)

Reach: Up to 3m
Use Case: High-speed, low-latency connections for intra-rack connectivity in HPC and AI clusters.
Key Features: Flat-top design for DGX H100 systems, supports 400G-to-400G or 800G-to-2x400G breakout.
Lengths: 0.5m, 1m, 1.5m, 2m, and 3m.

800G Twin-Port OSFP Breakout DACBreakout DAC

Reach: Up to 3m
Use Case: Connects 800G switches to two 400G or four 200G endpoints for flexible cluster configurations.
Key Features: Simplifies cabling for high-density environments, reduces complexity.
Lengths: 0.5m, 1m, 1.5m, 2m, and 3m.

  • Accelerated AI Training: High-bandwidth, low-latency transceivers optimise GPU-to-GPU and GPU-to-storage communication, speeding up large language model (LLM) training and inference.

  • Scalable Cluster Design: Twin-port 800G transceivers enable 64 ports of 400G in a 32-OSFP cage, maximising port density for growing clusters.

  • Energy Efficiency: Advanced thermal management (finned-top/flat-top designs) and low-power DAC solutions reduce operational costs.

  • Robust Performance: Low BER ensures stable performance, simplifying maintenance and supporting uninterrupted AI/ML workloads.

  • Versatile Connectivity: Supports both InfiniBand and Ethernet, enabling hybrid network architectures for diverse applications.

  • NVIDIA Mellanox Compatibility: Fully compatible with NVIDIA ConnectX-7 adapters, BlueField-3 DPUs, and Quantum-2/Spectrum-4 switches for seamless integration.

  • High-Speed Performance: Support 800G (2x400G) and 400G data rates with 100G-PAM4 modulation for unparalleled throughput.

  • Low Latency: Optimised for GPU-accelerated computing, ensuring minimal delays in AI/ML and HPC workloads.

  • Flexible Solutions: Available in single-mode, multimode, and DAC cable configurations to suit diverse network topologies.

  • Reliability & Support: 100% factory-tested with low bit-error rates (BER), backed by a 3-year warranty and lifetime technical support.

Flux IT is the future of IT procurement:
  • A huge inventory of new and EOL IT products
  • Fully tested and pre-shipping QA check with a choice of warranties available for peace of mind purchasing
  • Trade your old equipment for new
  • Located close to central London for same-day emergency deliveries on selected items
  • Short lead time and worldwide deliveries

Putting our customers first

“We had a critical issue with some hardware that required parts urgently. Did a Google search and Flux IT had the parts we required in stock and very reasonably priced. I called up and arranged for personal collection that morning. Within the hour I had collected the parts (in a very professional and COVID-safe manor), and an hour later the parts were installed and the systems were working fully again. “

Jack Chapman

“After getting on the phone with several other businesses looking for immediate support after a major incident, Flux-IT came to my rescue. They understood the timelines for delivery and guided me carefully while presenting numerous options till we agreed. The equipment was delivered in record time, and I would recommend them to anyone and everyone out there. Thanks to the team at Flux-IT, you got me back up and running and saved my job. If only there were 6 stars “

Mayor Adeogun

“Very helpful Company, one of our Network switches failed due to a local electricity power spike. I ordered online over Easter and then called Flux after the break to confirm prompt delivery. Flux IT provided great service and advice. I will certainly use Flux IT again. “

John Todd

“Really helpful advice, great pricing for the product purchased with prompt delivery. “

P Chester

Request a Quote

Simply fill out the form to tell us about your RFQ requirements. For a fast response, call 03330 048885, or use Livechat

FAQ

We supply OSFP modules across common reaches and breakouts, including 800G DR8/2xFR4/FR8L and 400G FR4/DR4 options, plus 800G→2x400G breakouts. Availability varies by vendor and application—ask for current stock and lead times.

Yes—our compatibles are lab-tested against popular NVIDIA Spectrum switches (e.g., SN5xxx series) and ConnectX adapters (e.g., ConnectX-7) for link-up, CMIS readout and performance. We’ll validate part codes against your exact platform and firmware.

Yes—passive/active DACs and AOCs are available in 400G and 800G lengths, plus 800G OSFP to 2x400G OSFP/QSFP-DD breakout options. Tell us your topology and we’ll size cable types, gauges and lengths.

Single-mode LC duplex is typical for FR/DR variants; parallel MPO/MTP may be used for certain short-reach/parallel types. We’ll confirm connector type, polarity and trunking to match your optics bill of materials.

Every module is checked for CMIS compliance, DOM/telemetry, wavelength/power, BER and eye performance where applicable. We can provide programming for host coding, and a test report on request.

OSFP modules dissipate more heat than lower-speed optics—ensure adequate airflow, heatsink clearance and front-to-back orientation in dense chassis. We can advise on thermal budgets and slot placement.

Compatibles are supplied with a Flux IT warranty (up to 2 years, model dependent) and meet relevant CE/RoHS requirements. Extended cover and advance-replacement can be quoted.

Core parts are held in UK/EU stock; others ship to order. We offer bundle discounts and project pricing, and you can trade in legacy transceivers or switches to offset cost.