News — QSFP/CX7

DGX Spark has four USB-C ports, an RJ-45 jack, and two QSFP connectors, and only one of them is built for clustering. Here's what each port is actually for, and which cable to use when linking two Sparks.

The NVIDIA DGX Spark is already a remarkable machine on its own — a desktop-sized AI supercomputer packing up to 1 petaFLOP of FP4 AI performance, 128 GB of unified memory, and a full NVIDIA software stack. But there are very real reasons why researchers, developers, and enterprises are looking to link two or more of them together. This post breaks down the why, the hardware limitations, and exactly how far you can scale a multi-Spark cluster. Short answer: the cable and what it costs Two DGX Sparks connect with one 0.5 m passive DAC — $84 or $187 at...

If you picked up an ASUS Ascent GX10, a Dell Pro Max GB10, an HP ZGX Nano AI Station, an MSI EdgeXpert MS-C931, a Lenovo ThinkStation PGX, a Gigabyte AI TOP ATOM, or an Acer Veriton GN100 instead of an NVIDIA-branded DGX Spark, you're probably searching for the same answer: does the DGX Spark cable work with your box? Short answer: yes. All eight of these systems are built on the same NVIDIA GB10 Grace Blackwell Superchip reference design as the DGX Spark, with an identical ConnectX-7 200GbE port on the back (sometimes called the QSFP/CX7 port, sometimes just labeled...

The NJAAKK-N911 (Amphenol) and LMTQF022-SD-R (Luxshare) are two manufacturer versions of the same NVIDIA-validated 400G QSFP112 passive DAC stacking cable for DGX Spark. Both connect the dedicated QSFP112 stacking port and deliver the same 400G performance. The only difference is the manufacturer and wire gauge (32AWG vs 30AWG). This guide explains when to use each.

If you have been researching how to connect two NVIDIA DGX Spark systems, you have probably seen several cable part numbers referenced: the Amphenol NJAAKK-N911, the Luxshare LMTQF022-SD-R, and the Mellanox MCP1650-V00AE30. This article explains what the NJAAKK-N911 is, how the DGX Spark's networking actually works, and how these cables relate to one another. Short answer: what it is and what it costs NJAAKK-N911 is $187 at Resilient Tec — or $84 for the 200G alternative The NJAAKK-N911 is one of NVIDIA’s two approved DGX Spark cables: a 0.5 m Amphenol QSFP112 passive DAC that runs at the Spark’s 200...

This is where most people get stuck. NVIDIA's DGX Spark documentation names two approved cables for connecting Sparks: the Amphenol NJAAKK-N911 and the Luxshare LMTQF022-SD-R (both QSFP112 passive DAC). These are sometimes listed under NVIDIA's own shorthand, the QSFP/CX7 cable. Because the Spark's ConnectX-7 QSFP ports run at up to 200 Gb/s, a 200G QSFP56 DAC also works well in practice. A viable, tried-and-tested lower-cost option we stock and that our customers use successfully is: Short answer: yes One 0.5 m QSFP-to-QSFP passive DAC connects two DGX Sparks — $84 or $187 at Resilient Tec NVIDIA validates the Amphenol NJAAKK-N911...