AI Cluster Fabric
AI Cluster Network Fabric
A GPU cluster runs at the speed of the link between its nodes. Buy the accelerators without the fabric and the nodes sit idle waiting on gradients — which is why the fabric belongs on the same bill of materials as the servers, not on a second purchase order three weeks later.
This page holds the parts that fabric is made of, across all three families at once: AI-grade switching (NVIDIA Spectrum SN2410, SN3700 and SN4600, Arista 7060 and 7280, Cisco Nexus 9000, Juniper QFX5120), the RDMA-capable adapters that terminate it (ConnectX-4 through ConnectX-7, BlueField-3 DPUs), and the 200G/400G/800G optics, DAC and AOC that join them — each optic coded for the switch platform it will sit in.
A rail-optimised layout — one leaf per GPU rail rather than one leaf per rack — changes the cable count and the optic mix before it changes the switch count, so we work the topology out with you and quote the switches, adapters, optics and cable lengths as one list.
135 configurations below · quotes returned within 48 business hours · purchase orders accepted
AI Cluster Network Fabric we configure and supply
Every system below is quoted to your workload — accelerator count, CPU, memory, storage and fabric are specified together rather than sold as a fixed SKU.
Arista 7280CR3-32P4 32 x 100GbE QSFP28 + 4 x 400GbE QSFP-DD Deep Buffer Spine and Edge Switch
Deep-buffer switching for spine and WAN edge, where microbursts would otherwise drop.
- Authorized supply
- Compatibility checked
- Volume pricing
Arista 7060DX4-32 32 x 400GbE QSFP-DD Layer 3 Data Center Spine Switch
Low-latency spine switching for AI cluster and leaf-spine fabrics.
- Authorized supply
- Compatibility checked
- Volume pricing
NVIDIA Spectrum SN2410 48x25GbE 48 x 25GbE SFP28 + 8 x 100GbE QSFP28 AI Fabric Ethernet Switch
The Ethernet side of a GPU cluster fabric, matched to ConnectX and BlueField.
- Authorized supply
- Compatibility checked
- Volume pricing
NVIDIA Spectrum SN3700 32x200GbE 32 x 200GbE QSFP56 AI Fabric Ethernet Switch
The Ethernet side of a GPU cluster fabric, matched to ConnectX and BlueField.
- Authorized supply
- Compatibility checked
- Volume pricing
NVIDIA Spectrum SN4600 64x200GbE 64 x 200GbE QSFP56 AI Fabric Ethernet Switch
The Ethernet side of a GPU cluster fabric, matched to ConnectX and BlueField.
- Authorized supply
- Compatibility checked
- Volume pricing
NVIDIA ConnectX -4 Lx 10/25GbE Dual-Port SFP28 Ethernet Network Adapter Card
SmartNIC with RoCE and hardware offload for storage and AI fabrics.
- Authorized supply
- Compatibility checked
- Volume pricing
NVIDIA ConnectX -6 Lx 25GbE Dual-Port SFP28 Ethernet Network Adapter Card
SmartNIC with RoCE and hardware offload for storage and AI fabrics.
- Authorized supply
- Compatibility checked
- Volume pricing
NVIDIA ConnectX -6 Dx 100GbE Dual-Port QSFP56 Ethernet Network Adapter Card
SmartNIC with RoCE and hardware offload for storage and AI fabrics.
- Authorized supply
- Compatibility checked
- Volume pricing
NVIDIA ConnectX -7 200GbE Dual-Port QSFP112 Ethernet Network Adapter Card
SmartNIC with RoCE and hardware offload for storage and AI fabrics.
- Authorized supply
- Compatibility checked
- Volume pricing
NVIDIA ConnectX -7 400GbE Single-Port OSFP Ethernet Network Adapter Card
SmartNIC with RoCE and hardware offload for storage and AI fabrics.
- Authorized supply
- Compatibility checked
- Volume pricing
400G QSFP-DD SR8 850nm 100m Optical Transceiver Module
Data center optic for switch-to-server and switch-to-switch links.
- Authorized supply
- Compatibility checked
- Volume pricing
Broadcom NetXtreme-E P1100G 100GbE Single-Port QSFP56 Ethernet Network Adapter Card
Widely OEM-qualified Ethernet adapters with RoCEv2 and SR-IOV offload.
- Authorized supply
- Compatibility checked
- Volume pricing
Dell Mellanox ConnectX-6 Lx 25GbE Dual-Port OCP 3.0 Network Adapter for PowerEdge Servers
Dell-qualified NDC and PCIe adapters with iDRAC inventory reporting intact.
- Authorized supply
- Compatibility checked
- Volume pricing
NVIDIA Mellanox ConnectX-5 MCX512A-ACAT 25GbE Dual-Port Ethernet Network Adapter
The RDMA adapter generation most existing GPU clusters were built on.
- Authorized supply
- Compatibility checked
- Volume pricing
NVIDIA Mellanox ConnectX-5 MCX516A-CCAT 100GbE Dual-Port Ethernet Network Adapter
The RDMA adapter generation most existing GPU clusters were built on.
- Authorized supply
- Compatibility checked
- Volume pricing
NVIDIA Mellanox ConnectX-5 MCX515A-CCAT 100GbE Single-Port Ethernet Network Adapter
The RDMA adapter generation most existing GPU clusters were built on.
- Authorized supply
- Compatibility checked
- Volume pricing
NVIDIA Mellanox ConnectX-4 MCX4121A-ACAT 25GbE Dual-Port Ethernet Network Adapter
Widely deployed 40G and 100G RDMA adapters, still a common like-for-like replacement.
- Authorized supply
- Compatibility checked
- Volume pricing
NVIDIA Mellanox ConnectX-4 MCX414A-BCAT 40GbE Dual-Port Ethernet Network Adapter
Widely deployed 40G and 100G RDMA adapters, still a common like-for-like replacement.
- Authorized supply
- Compatibility checked
- Volume pricing
NVIDIA Mellanox ConnectX-4 MCX416A-CCAT 100GbE Dual-Port Ethernet Network Adapter
Widely deployed 40G and 100G RDMA adapters, still a common like-for-like replacement.
- Authorized supply
- Compatibility checked
- Volume pricing
NVIDIA BlueField-3 B3140H 400GbE Single-Port Data Processing Unit
DPUs that move storage and network processing off the host CPU, for multi-tenant and AI fabrics.
- Authorized supply
- Compatibility checked
- Volume pricing
NVIDIA BlueField-3 B3210 100GbE Dual-Port Data Processing Unit
DPUs that move storage and network processing off the host CPU, for multi-tenant and AI fabrics.
- Authorized supply
- Compatibility checked
- Volume pricing
Dell Mellanox ConnectX-5 25GbE Dual-Port Network Adapter for PowerEdge Servers
Dell network daughter cards for 13G to 15G PowerEdge, with iDRAC reporting.
- Authorized supply
- Compatibility checked
- Volume pricing
NVIDIA 200G QSFP56 SR4 850nm Optical Transceiver Module
The 200G to 800G optics that GPU cluster fabrics run on, coded for Spectrum Ethernet and Quantum InfiniBand.
- Authorized supply
- Compatibility checked
- Volume pricing
NVIDIA 200G QSFP56 FR4 1310nm Optical Transceiver Module
The 200G to 800G optics that GPU cluster fabrics run on, coded for Spectrum Ethernet and Quantum InfiniBand.
- Authorized supply
- Compatibility checked
- Volume pricing
All 135 ai cluster fabric parts we supply
- NVIDIA 400G QSFP-DD SR8 850nm Optical Transceiver Module
- NVIDIA 400G QSFP-DD DR4 1310nm Optical Transceiver Module
- NVIDIA 400G QSFP-DD FR4 1310nm Optical Transceiver Module
- NVIDIA 400G OSFP SR8 850nm Optical Transceiver Module
- NVIDIA 800G OSFP SR8 850nm Optical Transceiver Module
- NVIDIA 800G OSFP DR8 1310nm Optical Transceiver Module
- Nexus Compute 200G QSFP56 1m Passive Direct Attach Copper Cable
- Nexus Compute 200G QSFP56 2m Passive Direct Attach Copper Cable
- Nexus Compute 200G QSFP56 3m Passive Direct Attach Copper Cable
- Nexus Compute 400G QSFP-DD 1m Passive Direct Attach Copper Cable
- Nexus Compute 400G QSFP-DD 2m Passive Direct Attach Copper Cable
- Nexus Compute 400G QSFP-DD 3m Passive Direct Attach Copper Cable
- Nexus Compute 200G QSFP56 to 4x SFP56 1m Breakout Direct Attach Copper Cable
- Nexus Compute 200G QSFP56 to 4x SFP56 2m Breakout Direct Attach Copper Cable
- Nexus Compute 200G QSFP56 to 4x SFP56 3m Breakout Direct Attach Copper Cable
- Arista 200G QSFP56 0.5m Passive Direct Attach Copper Cable
- Arista 200G QSFP56 1m Passive Direct Attach Copper Cable
- Arista 200G QSFP56 1.5m Passive Direct Attach Copper Cable
- Arista 200G QSFP56 2m Passive Direct Attach Copper Cable
- Arista 200G QSFP56 3m Passive Direct Attach Copper Cable
- Arista 200G QSFP56 5m Passive Direct Attach Copper Cable
- Arista 400G QSFP-DD 0.5m Passive Direct Attach Copper Cable
- Arista 400G QSFP-DD 1m Passive Direct Attach Copper Cable
- Arista 400G QSFP-DD 1.5m Passive Direct Attach Copper Cable
- Arista 400G QSFP-DD 2m Passive Direct Attach Copper Cable
- Arista 400G QSFP-DD 3m Passive Direct Attach Copper Cable
- Arista 400G QSFP-DD 5m Passive Direct Attach Copper Cable
- Juniper 200G QSFP56 0.5m Passive Direct Attach Copper Cable
- Juniper 200G QSFP56 1m Passive Direct Attach Copper Cable
- Juniper 200G QSFP56 1.5m Passive Direct Attach Copper Cable
- Juniper 200G QSFP56 2m Passive Direct Attach Copper Cable
- Juniper 200G QSFP56 3m Passive Direct Attach Copper Cable
- Juniper 200G QSFP56 5m Passive Direct Attach Copper Cable
- Juniper 400G QSFP-DD 0.5m Passive Direct Attach Copper Cable
- Juniper 400G QSFP-DD 1m Passive Direct Attach Copper Cable
- Juniper 400G QSFP-DD 1.5m Passive Direct Attach Copper Cable
- Juniper 400G QSFP-DD 2m Passive Direct Attach Copper Cable
- Juniper 400G QSFP-DD 3m Passive Direct Attach Copper Cable
- Juniper 400G QSFP-DD 5m Passive Direct Attach Copper Cable
- HPE 200G QSFP56 0.5m Passive Direct Attach Copper Cable
- HPE 200G QSFP56 1m Passive Direct Attach Copper Cable
- HPE 200G QSFP56 1.5m Passive Direct Attach Copper Cable
- HPE 200G QSFP56 2m Passive Direct Attach Copper Cable
- HPE 200G QSFP56 3m Passive Direct Attach Copper Cable
- HPE 200G QSFP56 5m Passive Direct Attach Copper Cable
- HPE 400G QSFP-DD 0.5m Passive Direct Attach Copper Cable
- HPE 400G QSFP-DD 1m Passive Direct Attach Copper Cable
- HPE 400G QSFP-DD 1.5m Passive Direct Attach Copper Cable
- HPE 400G QSFP-DD 2m Passive Direct Attach Copper Cable
- HPE 400G QSFP-DD 3m Passive Direct Attach Copper Cable
- HPE 400G QSFP-DD 5m Passive Direct Attach Copper Cable
- Dell Technologies 200G QSFP56 0.5m Passive Direct Attach Copper Cable
- Dell Technologies 200G QSFP56 1m Passive Direct Attach Copper Cable
- Dell Technologies 200G QSFP56 1.5m Passive Direct Attach Copper Cable
- Dell Technologies 200G QSFP56 2m Passive Direct Attach Copper Cable
- Dell Technologies 200G QSFP56 3m Passive Direct Attach Copper Cable
- Dell Technologies 200G QSFP56 5m Passive Direct Attach Copper Cable
- Dell Technologies 400G QSFP-DD 0.5m Passive Direct Attach Copper Cable
- Dell Technologies 400G QSFP-DD 1m Passive Direct Attach Copper Cable
- Dell Technologies 400G QSFP-DD 1.5m Passive Direct Attach Copper Cable
- Dell Technologies 400G QSFP-DD 2m Passive Direct Attach Copper Cable
- Dell Technologies 400G QSFP-DD 3m Passive Direct Attach Copper Cable
- Dell Technologies 400G QSFP-DD 5m Passive Direct Attach Copper Cable
- NVIDIA Networking 200G QSFP56 0.5m Passive Direct Attach Copper Cable
- NVIDIA Networking 200G QSFP56 1m Passive Direct Attach Copper Cable
- NVIDIA Networking 200G QSFP56 1.5m Passive Direct Attach Copper Cable
- NVIDIA Networking 200G QSFP56 2m Passive Direct Attach Copper Cable
- NVIDIA Networking 200G QSFP56 3m Passive Direct Attach Copper Cable
- NVIDIA Networking 200G QSFP56 5m Passive Direct Attach Copper Cable
- NVIDIA Networking 400G QSFP-DD 0.5m Passive Direct Attach Copper Cable
- NVIDIA Networking 400G QSFP-DD 1m Passive Direct Attach Copper Cable
- NVIDIA Networking 400G QSFP-DD 1.5m Passive Direct Attach Copper Cable
- NVIDIA Networking 400G QSFP-DD 2m Passive Direct Attach Copper Cable
- NVIDIA Networking 400G QSFP-DD 3m Passive Direct Attach Copper Cable
- NVIDIA Networking 400G QSFP-DD 5m Passive Direct Attach Copper Cable
- Nexus Compute 200G QSFP56 3m Active Optical Cable
- Nexus Compute 200G QSFP56 5m Active Optical Cable
- Nexus Compute 200G QSFP56 7m Active Optical Cable
- Nexus Compute 200G QSFP56 10m Active Optical Cable
- Nexus Compute 200G QSFP56 15m Active Optical Cable
- Nexus Compute 200G QSFP56 20m Active Optical Cable
- Nexus Compute 200G QSFP56 30m Active Optical Cable
- Nexus Compute 400G QSFP-DD 3m Active Optical Cable
- Nexus Compute 400G QSFP-DD 5m Active Optical Cable
- Nexus Compute 400G QSFP-DD 7m Active Optical Cable
- Nexus Compute 400G QSFP-DD 10m Active Optical Cable
- Nexus Compute 400G QSFP-DD 15m Active Optical Cable
- Nexus Compute 400G QSFP-DD 20m Active Optical Cable
- Nexus Compute 400G QSFP-DD 30m Active Optical Cable
- NVIDIA Networking 200G QSFP56 3m Active Optical Cable
- NVIDIA Networking 200G QSFP56 5m Active Optical Cable
- NVIDIA Networking 200G QSFP56 10m Active Optical Cable
- NVIDIA Networking 200G QSFP56 15m Active Optical Cable
- NVIDIA Networking 200G QSFP56 20m Active Optical Cable
- NVIDIA Networking 200G QSFP56 30m Active Optical Cable
- NVIDIA Networking 400G QSFP-DD 3m Active Optical Cable
- NVIDIA Networking 400G QSFP-DD 5m Active Optical Cable
- NVIDIA Networking 400G QSFP-DD 10m Active Optical Cable
- NVIDIA Networking 400G QSFP-DD 15m Active Optical Cable
- NVIDIA Networking 400G QSFP-DD 20m Active Optical Cable
- NVIDIA Networking 400G QSFP-DD 30m Active Optical Cable
- Nexus Compute 200G QSFP56 to 4x SFP56 1m Passive Direct Attach Copper Cable
- Nexus Compute 200G QSFP56 to 4x SFP56 1.5m Passive Direct Attach Copper Cable
- Nexus Compute 200G QSFP56 to 4x SFP56 2m Passive Direct Attach Copper Cable
- Nexus Compute 200G QSFP56 to 4x SFP56 3m Passive Direct Attach Copper Cable
- Nexus Compute 200G QSFP56 to 4x SFP56 5m Passive Direct Attach Copper Cable
- Nexus Compute 400G QSFP-DD to 4x QSFP28 1m Passive Direct Attach Copper Cable
- Nexus Compute 400G QSFP-DD to 4x QSFP28 1.5m Passive Direct Attach Copper Cable
- Nexus Compute 400G QSFP-DD to 4x QSFP28 2m Passive Direct Attach Copper Cable
- Nexus Compute 400G QSFP-DD to 4x QSFP28 3m Passive Direct Attach Copper Cable
- Nexus Compute 400G QSFP-DD to 4x QSFP28 5m Passive Direct Attach Copper Cable
What we need to quote accurately
A configuration quote takes minutes when these are known and days of back-and-forth when they are not. You do not need all of them to start — send what you have.
- The workload: model sizes, training or inference, and expected concurrency
- Node count, and whether this is a single system or a scaling cluster
- Rack power and cooling available per rack, and inlet temperature
- Existing estate — the vendor and management tooling you already run
- Network fabric: InfiniBand, Ethernet, and the speed you are standardised on
- Timeline, and whether the budget is approved or being built
How we quote
- 1
Send the requirement
An email, a bill of materials, or a rough description of the workload. All three work.
- 2
We validate the configuration
Accelerator, chassis, fabric, power and cooling checked against each other before anything is priced.
- 3
Itemised quote within 48 hours
Line-by-line pricing, current availability and lead time, with warranty terms stated.
AI network fabric — buyer questions
Do you supply InfiniBand as well as Ethernet?
The parts listed on this page are Ethernet: Spectrum AI-fabric switches, ConnectX and BlueField adapters, and QSFP-DD/OSFP optics and cable. InfiniBand switches and HCAs are not in the published catalogue — they are sourced to order and quoted alongside the cluster design rather than listed as stock lines. Note that the NVIDIA-coded 400G and 800G optics here carry NVIDIA Spectrum and Quantum coding, so the optic side of an InfiniBand build is already covered. Tell us which fabric you are standardising on and we will quote it either way.
What does rail-optimised mean, and does it change the parts list?
In a rail-optimised design each GPU rail in a node connects to its own leaf switch, so traffic between the same rail on different nodes crosses one switch hop instead of traversing a rack leaf. It usually means more, shorter links and a different optic-to-DAC ratio than a conventional top-of-rack layout, because the leaf is no longer in the same rack as every node it serves. The switch models rarely change; the cable schedule always does.
Can 400G switches feed nodes that are still on 100G?
Yes, and it is the normal way to phase an upgrade. A 400G QSFP-DD port breaks out to four 100G QSFP28 ports, and we list 400G QSFP-DD to 4x QSFP28 passive breakout cables at 1m, 1.5m, 2m, 3m and 5m for exactly that. Check the switch supports breakout on the port group you plan to use — we confirm that against the platform before quoting.
Do the optics have to be coded for our switches?
Yes. An optic is coded in EEPROM for a switch vendor, and the wrong coding usually gets the port disabled rather than merely running slow. We list optics coded for Cisco, Arista, Juniper, HPE/Aruba, Dell, Fortinet and NVIDIA, plus multi-coded lines coded to order. Send us the switch model with the order and the optic ships coded to match it.
Compare with other platforms
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400G Ethernet Switching, Adapters and Optics
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NVIDIA ConnectX and BlueField Adapters
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Leaf and Spine Data Center Switches
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NVIDIA H100 Servers
View systemsBrowse the full range of GPU servers and AI clusters, or the component catalogue for drives, memory, optics and spares.