Two Different Manufacturers, One NVIDIA-Approved Cable Type
If you're shopping for a cable to connect two NVIDIA DGX Spark systems and you see two different part numbers — NJAAKK-N911 and LMTQF022-SD-R — you might wonder what's different. The short answer: they are functionally identical cables made by two different manufacturers, and both are listed by NVIDIA as approved cables for connecting DGX Spark systems. Both are also sometimes marketed under the shorthand QSFP/CX7 cable. This post explains each part number, who makes them, and how to choose.
Short answer: same cable, same price
NJAAKK-N911 and LMTQF022-SD-R are both $187 at Resilient Tec
Both are 0.5 m QSFP112 passive DACs that NVIDIA approves for DGX Spark; the only measurable difference is wire gauge (32AWG Amphenol vs 30AWG Luxshare). Because the Spark’s ports run at 200 Gb/s, the lower-cost 200G QSFP56 MCP1650-V00AE30 also works well in practice.
|
NJAAKK-N911 — QSFP112 400G stacking cable, 0.5 m Amphenol. NVIDIA-validated part for DGX Spark. |
$187 Add to cart |
|
LMTQF022-SD-R — QSFP112 400G stacking cable, 0.5 m Luxshare. NVIDIA-validated part for DGX Spark. |
$187 Add to cart |
|
MCP1650-V00AE30 — QSFP56 200G DAC, 0.5 m Lowest-cost route. Works reliably on DGX Spark. |
$84 Add to cart |
Resilient Tec sells the NJAAKK-N911 and LMTQF022-SD-R for $187 each and the MCP1650-V00AE30 for $84 directly at resilient-tec.com — new, lifetime warranty, shipping from Knoxville, Tennessee. Prices checked September 11, 2026. POs and net terms available.
What These Part Numbers Are
| Attribute | NJAAKK-N911 | LMTQF022-SD-R |
|---|---|---|
| Manufacturer | Amphenol | Luxshare |
| Interface | QSFP112 | QSFP112 |
| Data Rate | 400G-rated (runs at 200 Gb/s on DGX Spark) | 400G-rated (runs at 200 Gb/s on DGX Spark) |
| Cable Type | Passive DAC (copper) | Passive DAC (copper) |
| Length | 0.5 m (400mm) | 0.5 m (400mm) |
| AWG | 32AWG | 30AWG |
| NVIDIA status | Approved DGX Spark cable | Approved DGX Spark cable |
| Price at Resilient Tec | $187 | $187 |
| Port used | DGX Spark ConnectX-7 QSFP port | DGX Spark ConnectX-7 QSFP port |
The Manufacturers
Amphenol — NJAAKK-N911. Amphenol is a global leader in interconnect technology and one of the OEMs for NVIDIA DAC cables. The NJAAKK-N911 is Amphenol's part number for this cable (the 0.5m version is also referenced as NJAAKK0006). It uses 32AWG wire.
Luxshare — LMTQF022-SD-R. Luxshare Precision is one of the world's largest cable and connector manufacturers. The LMTQF022-SD-R is Luxshare's part number for the same cable specification, and NVIDIA lists it as an approved cable. It uses 30AWG wire, making it slightly thicker than the Amphenol version.
Are They Interchangeable?
Yes. Both cables perform the same function, plug into the same ports, and are both listed by NVIDIA as approved cables for connecting DGX Spark systems. Either one gives you the same QSFP112 passive copper connection between two DGX Sparks, letting you pool the two units' compute and memory over a direct link.
The One Technical Difference: AWG
The only measurable difference is wire gauge: the NJAAKK-N911 is 32AWG (slightly thinner, more flexible) and the LMTQF022-SD-R is 30AWG (slightly thicker conductor). At 0.5 meters this has no meaningful impact on performance or signal integrity.
What Port Do These Cables Connect To?
Both cables connect to the DGX Spark's ConnectX-7 QSFP ports — the two QSFP ports on the back of the unit. Per NVIDIA's documentation there is no separate "stacking port"; those same two ConnectX-7 QSFP ports are used both for connecting two Sparks together and for standard Ethernet / RoCE networking, and each port is capped at up to 200 Gb/s. So while these are QSFP112 / 400G-rated cables, on a DGX Spark the link runs at 200 Gb/s.
Good to Know
- NVIDIA's clustering guidance covers connecting two or three Sparks directly, and up to four through a switch.
- The same ConnectX-7 ports handle both the unit-to-unit connection and general Ethernet networking — there is no separate dedicated port.
- The 0.5m length is what NVIDIA references for two units placed side by side.
- The same approved cables apply to the OEM GB10 systems (HP ZGX Nano AI Station, Dell Pro Max with GB10, ASUS Ascent GX10).
Which Should You Buy?
Both are excellent, spec-matching choices — pick whichever is in stock or better priced: NJAAKK-N911 (Amphenol) or LMTQF022-SD-R (Luxshare) — both $187 at Resilient Tec. If you want a lower-cost alternative, a 200G QSFP56 DAC such as the MCP1650-V00AE30 ($84) also works well in practice, since the Spark's ports run at 200 Gb/s.
Further reading: DGX Spark interconnect reference — approved part numbers, real-world throughput, and what to buy at two, three and four or more nodes.
FAQ
Is the NJAAKK-N911 the same as the LMTQF022-SD-R?
Functionally, yes. Both are 0.5 m QSFP112 passive DAC cables that NVIDIA lists as approved for connecting DGX Spark systems. Amphenol makes the NJAAKK-N911 (32AWG) and Luxshare makes the LMTQF022-SD-R (30AWG); at 0.5 m the gauge difference has no meaningful impact.
How much do the NJAAKK-N911 and LMTQF022-SD-R cost?
Both are $187 at Resilient Tec, sold new with a lifetime warranty. The lower-cost MCP1650-V00AE30 200G QSFP56 DAC is $84 (prices checked September 11, 2026).
Where can I buy the NJAAKK-N911 or LMTQF022-SD-R?
Directly from Resilient Tec, which ships from Knoxville, Tennessee, with POs and net terms available: NJAAKK-N911 — $187 at resilient-tec.com · LMTQF022-SD-R — $187 at resilient-tec.com
Which should I buy?
Either — pick whichever is in stock. If you don’t need NVIDIA’s exact named part, the 200G QSFP56 MCP1650-V00AE30 ($84 at Resilient Tec) also works well in practice, since the Spark’s ports run at 200 Gb/s.
Ready to Buy?
Tested and shipping from Knoxville, Tennessee. Lifetime warranty, backed by Resilient Tec. Prices below checked September 11, 2026.
- MCP1650-V00AE30 — 200G QSFP56 DAC, 0.5 m — $84, our best-selling Spark-to-Spark link
- NJAAKK-N911 — QSFP112 400G stacking cable, 0.5 m — $187, NVIDIA-validated (Amphenol)
- LMTQF022-SD-R — QSFP112 400G stacking cable, 0.5 m — $187, NVIDIA-validated (Luxshare)
Scaling to 3 or 4+ nodes, or mixing GB10 vendors? Send us your node count and hardware and we'll confirm exactly what to buy — including when a switch is the real answer.
You Might Also Need
- Network switches — required the moment you go past 4 direct-connect nodes; a 200GbE-capable managed switch, not a repurposed office switch
- QSFP-DD to QSFP56 breakout cables — the part that actually lets a switch talk to Spark-class ports at 4+ nodes
- Outgrowing desktop hardware? — how the same DAC-first approach scales up to rack-mounted DGX H100/H200 over NDR InfiniBand
- NVIDIA OSFP part-number crosswalk — for when the next step up is optics, not copper
- Cat8 and structured cabling for the rest of the rack