Resilient Tec compatible cable — equivalent to the cables NVIDIA lists as approved for DGX Spark
→ DGX Spark interconnect reference — approved part numbers, real-world throughput, and what to buy at two, three and four or more nodes.
Part Number: NJAAKK-N911
Equivalent to: Amphenol NJAAKK-0006 (0.5 m) — see the part number decoder below
Description: QSFP112 Passive Direct Attach Copper (DAC) cable, 400G-rated, 0.5 m (1.6 ft)
This is a 0.5 m passive direct-attach copper cable with QSFP112 connectors on both ends, rated for up to 400G on hardware that supports it. It is a compatible build supplied by Resilient Tec, matching the specification of the Amphenol NJAAKK-0006 that NVIDIA lists as an approved DGX Spark cable.
On the NVIDIA DGX Spark — and on the OEM GB10 systems built on the same reference platform (HP ZGX Nano AI Station, Dell Pro Max with GB10, ASUS Ascent GX10) — you plug this cable into the system's ConnectX-7 QSFP ports to link two units directly, with no switch required. Per NVIDIA's DGX Spark documentation, each of these QSFP ports operates at up to 200 Gb/s, so the link runs at 200 Gb/s even though the cable itself is QSFP112 / 400G-rated. There is no separate "dedicated stacking port" — the ConnectX-7 QSFP ports are used both for connecting units together and for standard Ethernet / RoCE networking.
Part Number Decoder — NJAAKK-N911 vs NJAAKK-0006 vs LMTQF022-SD-R
Several part numbers circulate for the DGX Spark stacking cable. They are one specification across two manufacturers and two lengths — and length is the only thing that actually separates them:
| Part Number |
Length |
Manufacturer |
What it is |
| NJAAKK-N911 |
400 mm (1.3 ft) |
Amphenol |
NVIDIA-listed approved cable — the short version, 32AWG, LSZH |
| NJAAKK-0006 · NJAAKK0006 · SF-NJAAKK0006-000.5M |
0.5 m (1.6 ft) |
Amphenol |
NVIDIA-listed approved cable — the 0.5 m version of the same cable |
| LMTQF022-SD-R |
400 mm (1.3 ft) |
Luxshare |
NVIDIA-listed approved cable — Luxshare equivalent, 30AWG |
| NJAAKKR-0006 |
0.5 m (1.6 ft) |
compatible market |
A compatible-market spelling of the 0.5 m part |
What this listing is. A compatible NJAAKK-N911 build at 0.5 m, supplied by Resilient Tec. It is not a genuine Amphenol or Luxshare part. It meets the same QSFP112 passive copper specification as the NVIDIA-listed NJAAKK-0006 and works normally in DGX Spark and GB10 systems.
If your procurement rules require a genuine OEM part number, ask us for a quote — we will source it rather than substitute, and tell you the lead time up front.
Looking for the NJAAKK-0006? This is the cable you want — same 0.5 m length, same QSFP112 connectors on both ends, same passive copper construction.
A note on length. Amphenol's own NJAAKK-N911 is the 400 mm version, while compatible suppliers commonly apply the N911 family number to a 0.5 m cable. That is why two listings can both say NJAAKK-N911 and arrive at different lengths. Buy on the stated length, not on the part number alone. This one is 0.5 m.
Technical Specifications
| Specification |
Value |
| Part Number |
NJAAKK-N911 |
| Supplied by |
Resilient Tec (compatible build) |
| OEM equivalent |
Amphenol NJAAKK-0006 (0.5 m) |
| Interface |
QSFP112 |
| Cable Rating |
400G-rated (4 x 100G lanes) |
| Link speed on DGX Spark / GB10 systems |
Up to 200 Gb/s per port (port-capped by NVIDIA spec) |
| Cable Type |
Passive Direct Attach Copper (DAC) |
| Length |
0.5 m (50 cm / 1.6 ft) |
| Connector Type |
QSFP112 on both ends |
| Port Used |
ConnectX-7 QSFP port |
| NVIDIA approval status |
Compatible equivalent to the NVIDIA-listed approved cables (Amphenol NJAAKK-N911 / NJAAKK-0006, Luxshare LMTQF022-SD-R) |
Which Port Does This Use?
Each DGX Spark (and each OEM GB10 system) has two ConnectX-7 QSFP ports on the rear panel. These same ports are used both to connect units together and for general Ethernet / RoCE networking. NVIDIA caps each port at up to 200 Gb/s, and notes that using a higher-speed cable does not increase the link rate because the port itself is the limit.
NVIDIA names these approved cables for this connection:
-
NJAAKK-N911 (Amphenol, 400 mm) and NJAAKK-0006 (Amphenol, 0.5 m)
-
LMTQF022-SD-R (Luxshare, 400 mm) — also listed here
The MCP1650-V00AE30 (200G QSFP56 DAC) is not a part NVIDIA names, but it is a viable, tried-and-tested lower-cost 200G option that our customers have used successfully to stack these systems, with no reported issues.
How Many Cables Do You Need?
| Nodes |
Topology |
Switch |
Cables |
| 2 |
Point to point |
No |
1 × this cable |
| 3 |
Ring (both ports per node) |
No |
3 × this cable |
| 4 |
Ring, custom NCCL — not NVIDIA-supported |
No |
4 × this cable. In a rack, wire it folded (1→2→4→3→1) so no cable spans more than two units and 0.5 m reaches. |
| 4+ |
Through a 400G switch |
Yes |
One 200G QSFP56 DAC per node, or an MCP7H60 breakout on the switch side |
Good to Know
-
Up to four units connect without a switch. Two Sparks take one cable. Three take three cables in a ring, using both QSFP ports on every unit — the configuration NVIDIA documents. Four can also run switchless as a ring of four cables using a custom NCCL build; owners are running it today, but it is outside NVIDIA support and cannot grow past four. A switch is the supported route at four nodes and the only route beyond. How the four-node switchless ring works
- Connects units directly — no switch, transceivers, or adapters required
- 0.5 m is ideal for two compact desktop units placed side by side; NVIDIA references short passive DAC lengths for this use
- Works across the GB10 ecosystem (NVIDIA DGX Spark, HP ZGX Nano AI Station, Dell Pro Max with GB10, ASUS Ascent GX10), which share the same ConnectX-7 networking
- The ConnectX-7 QSFP ports operate in Ethernet mode (with RoCE), not InfiniBand
- Passive copper — no transceivers, no power draw, no firmware
Quick Checklist — Is This the Right Cable?
You have two, three or four GB10-based systems (NVIDIA DGX Spark or an HP / Dell / ASUS equivalent) — four as a switchless ring needs a custom NCCL build. You want to link them directly through their ConnectX-7 QSFP ports. You need a 0.5 m passive copper cable with QSFP112 connectors on both ends. You are shopping for an NJAAKK-0006, NJAAKK-N911, NJAAKKR-0006 or LMTQF022-SD-R and want a spec-matching cable at a working price.
Related Guides
NVIDIA DGX Spark Stacking Cable NJAAKK-N911: What It Does, Who Needs It, and How It Compares to the DAC
NJAAKK-N911 vs NJAAKK-0006 vs LMTQF022-SD-R: What's the Difference?
How to Connect Two NVIDIA DGX Spark Systems: The Cable You Need and Why
Can You Build a 4-Node DGX Spark Cluster Without a Switch? The Ring That Works and the Breakout Trick That Doesn't
COMPATIBILITY DOCUMENTATION
Download compatibility report: NJAAKK-N911_Compatibility_Report
Guide includes: compatibility notes for NVIDIA DGX Spark and OEM GB10 platforms, ConnectX-7 200GbE port verification, dual-system interconnect setup instructions.
