LMTQF022-SD-R QSFP112 400G-Rated Passive DAC Cable, 0.5m – NVIDIA DGX Spark Approved (Luxshare) | Resilient Tec
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OEM-equivalent — NVIDIA DGX Spark approved cable
→ DGX Spark interconnect reference — approved part numbers, real-world throughput, and what to buy at two, three and four or more nodes.
Part Number: LMTQF022-SD-R (Luxshare)
Description: QSFP112 Passive Direct Attach Copper (DAC) cable, 400G-rated, 0.5m (1.6 ft)
The LMTQF022-SD-R is one of the two cables NVIDIA lists as approved for connecting DGX Spark systems, alongside the Amphenol NJAAKK-N911. 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. The two parts are the same physical cable type from two different manufacturers.
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 | LMTQF022-SD-R (Luxshare) |
| 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 Amphenol NJAAKK-N911) |
The Two NVIDIA-Approved Cables
For connecting DGX Spark systems, NVIDIA names two cables. Either is a safe, spec-matching choice:
- LMTQF022-SD-R (Luxshare) — this product
- NJAAKK-N911 (Amphenol) — the functionally equivalent alternative
The MCP1650-V00AE30 (200G QSFP56 DAC) is not one of the parts 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
- 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
Related Guides
NVIDIA DGX Spark Stacking Cable: What It Does and How It Compares to the DAC
How to Connect Two NVIDIA DGX Spark Systems: The Cable You Need and Why
Shop
Also available: NJAAKK-N911 (Amphenol equivalent) and the lower-cost MCP1650-V00AE30 200G QSFP56 DAC.
OEM-equivalent — NVIDIA DGX Spark approved cable
→ DGX Spark interconnect reference — approved part numbers, real-world throughput, and what to buy at two, three and four or more nodes.
Part Number: LMTQF022-SD-R (Luxshare)
Description: QSFP112 Passive Direct Attach Copper (DAC) cable, 400G-rated, 0.5m (1.6 ft)
The LMTQF022-SD-R is one of the two cables NVIDIA lists as approved for connecting DGX Spark systems, alongside the Amphenol NJAAKK-N911. 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. The two parts are the same physical cable type from two different manufacturers.
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 | LMTQF022-SD-R (Luxshare) |
| 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 Amphenol NJAAKK-N911) |
The Two NVIDIA-Approved Cables
For connecting DGX Spark systems, NVIDIA names two cables. Either is a safe, spec-matching choice:
- LMTQF022-SD-R (Luxshare) — this product
- NJAAKK-N911 (Amphenol) — the functionally equivalent alternative
The MCP1650-V00AE30 (200G QSFP56 DAC) is not one of the parts 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
- 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
Related Guides
NVIDIA DGX Spark Stacking Cable: What It Does and How It Compares to the DAC
How to Connect Two NVIDIA DGX Spark Systems: The Cable You Need and Why
Shop
Also available: NJAAKK-N911 (Amphenol equivalent) and the lower-cost MCP1650-V00AE30 200G QSFP56 DAC.