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SKU:NJAAKK-0006
The 0.5m Amphenol QSFP112 passive copper cable that NVIDIA approves for linking two DGX Spark systems directly, at up to 200Gb/s per port. Amphenol NJAAKK-0006.
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DGX Spark accessory / ConnectX-7 networking
This 0.5m Amphenol QSFP112 passive copper cable is approved by NVIDIA for linking the ConnectX-7 QSFP ports of two DGX Spark systems over a direct Ethernet link. NVIDIA quotes support for AI models of up to 405 billion parameters on two linked DGX Spark systems.
Other GB10 systems, such as the Dell Pro Max with GB10, use the same type of port, but their makers have not listed this part, and linking systems from different brands is not documented.
NVIDIA's DGX Spark user guide lists the approved cables as the Amphenol NJAAKK-N911 (0.4m), its 0.5m version NJAAKK0006 (this cable) and a Luxshare 0.4m cable. The cable is rated for 400G; each DGX Spark QSFP port runs at up to 200Gb/s, so the link runs at up to 200Gb/s.
One cable links two DGX Spark systems directly, and three connect in a ring with three cables. The QSFP ports run Ethernet only, with RDMA over Converged Ethernet (RoCE) for the software that spreads work across the systems. Four systems need a switch.
NVIDIA's DGX Spark user guide shows how to fit the cable: pull tab facing up, without force. NVIDIA's "Connect Two Sparks" playbook then covers the same user name on both systems, the same physical port on each unit, IP addressing and SSH, and the separate "NCCL for Multiple Sparks" playbook covers NCCL. On DGX Spark, NVIDIA Sync's Cluster Assistant offers a guided alternative for the network setup; it needs the April 2026 system software release or later.
Specifications for one cable
| Manufacturer part number | Amphenol NJAAKK-0006 (written NJAAKK0006 by NVIDIA); distributor part SF-NJAAKK0006-000.5M |
|---|---|
| Length | 0.5m (500mm) |
| Connectors | QSFP112 to QSFP112, straight |
| Type | Passive copper direct-attach cable, 32AWG |
| Rating | 4 lanes at 112Gb/s (400GBASE-CR4) |
| Power | None required (passive) |
| Link speed | Up to 200Gb/s per QSFP port |
|---|---|
| Network type | Ethernet, with RoCE |
| Direct connections | Two systems with one cable; three in a ring with three cables |
| Four systems | A QSFP switch with at least four 200Gb/s QSFP56-DD ports (NVIDIA's requirement), plus one switch-compatible cable per system; check the switch maker's supported cables and the length you need |
| Orientation | Pull tab facing up (NVIDIA); do not force the connector. On other GB10 systems, follow the maker's guide |
The cable's 400G rating is higher than the DGX Spark port speed; the link between two systems runs at up to 200Gb/s.
Included
One Amphenol NJAAKK-0006 QSFP112 passive copper cable, 0.5m. No software, adapters or systems are included.
Plan your setup
Dell's guide asks for a ConnectX-7 QSFP 200G cable between the two systems but does not name a part number or length, and Dell has not listed this Amphenol cable. NVIDIA approves this cable for DGX Spark, and the Dell Pro Max with GB10 uses the same type of ConnectX-7 QSFP port. If you need a Dell-supported part, check with Dell before ordering.
No. The cable is rated for 400G, but each DGX Spark QSFP port runs at up to 200Gb/s, so the link between two systems runs at up to 200Gb/s.
Three DGX Spark systems can connect directly in a ring using three cables. Four systems need a QSFP switch with at least four 200Gb/s QSFP56-DD ports and switch-compatible cables; check the switch maker's supported cables and the length you need.
Either QSFP port works, but NVIDIA's setup guide assumes the same physical port on each unit. On DGX Spark, insert the cable with its pull tab facing up and do not force it; pull the tab to remove it.
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