NJAAKK-N911 QSFP112 400G-Rated Passive DAC Cable, 0.5m – NVIDIA DGX Spark Approved Stacking Cable | Resilient Tec
Warranty: Lifetime
OEM-equivalent — NVIDIA DGX Spark approved cable
Part Number: NJAAKK-N911 (Amphenol)
Description: QSFP112 Passive Direct Attach Copper (DAC) cable, 400G-rated, 0.5m (1.6 ft)
The NJAAKK-N911 is one of the two cables NVIDIA lists as approved for connecting DGX Spark systems, alongside the Luxshare LMTQF022-SD-R. It is a 0.5m passive direct-attach copper cable with QSFP112 connectors on both ends, rated for up to 400G on hardware that supports it.
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 two units together and for standard Ethernet / RoCE networking.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | NJAAKK-N911 (Amphenol) |
| 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 (1.6 ft) |
| Connector Type | QSFP112 on both ends |
| Port Used | ConnectX-7 QSFP port |
| NVIDIA approval | Listed as an approved DGX Spark cable (with 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 two 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 lists two approved cables for this connection:
- NJAAKK-N911 (Amphenol) — this product
- LMTQF022-SD-R (Luxshare) — the functionally equivalent alternative
The MCP1650-V00AE30 (200G QSFP56 DAC) is not the 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.
Good to Know
- Connects two 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
Quick Checklist — Is This the Right Cable?
You have two GB10-based systems (NVIDIA DGX Spark or an HP / Dell / ASUS equivalent). You want to link them directly through their ConnectX-7 QSFP ports. You want an NVIDIA-approved DGX Spark cable (NJAAKK-N911 or LMTQF022-SD-R). You need a 0.5 m passive copper cable with QSFP112 connectors on both ends.
Related Guides
How to Connect Two NVIDIA DGX Spark Systems: The Cable You Need and Why
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.
OEM-equivalent — NVIDIA DGX Spark approved cable
Part Number: NJAAKK-N911 (Amphenol)
Description: QSFP112 Passive Direct Attach Copper (DAC) cable, 400G-rated, 0.5m (1.6 ft)
The NJAAKK-N911 is one of the two cables NVIDIA lists as approved for connecting DGX Spark systems, alongside the Luxshare LMTQF022-SD-R. It is a 0.5m passive direct-attach copper cable with QSFP112 connectors on both ends, rated for up to 400G on hardware that supports it.
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 two units together and for standard Ethernet / RoCE networking.
Technical Specifications
| Specification | Value |
|---|---|
| Part Number | NJAAKK-N911 (Amphenol) |
| 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 (1.6 ft) |
| Connector Type | QSFP112 on both ends |
| Port Used | ConnectX-7 QSFP port |
| NVIDIA approval | Listed as an approved DGX Spark cable (with 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 two 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 lists two approved cables for this connection:
- NJAAKK-N911 (Amphenol) — this product
- LMTQF022-SD-R (Luxshare) — the functionally equivalent alternative
The MCP1650-V00AE30 (200G QSFP56 DAC) is not the 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.
Good to Know
- Connects two 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
Quick Checklist — Is This the Right Cable?
You have two GB10-based systems (NVIDIA DGX Spark or an HP / Dell / ASUS equivalent). You want to link them directly through their ConnectX-7 QSFP ports. You want an NVIDIA-approved DGX Spark cable (NJAAKK-N911 or LMTQF022-SD-R). You need a 0.5 m passive copper cable with QSFP112 connectors on both ends.
Related Guides
How to Connect Two NVIDIA DGX Spark Systems: The Cable You Need and Why
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.