HP ZGX Nano Cluster Cable: 0.5m QSFP112 400G DAC
To cluster two HP ZGX Nano G1n AI Station nodes you need one 0.5m QSFP112 400G passive DAC cable in the QSFP112 port on each unit. HP's ZGX Nano is a secure, desk-side build of NVIDIA's GB10 Grace Blackwell platform, and it carries the same ConnectX-7 NIC as the DGX Spark, so it takes the exact cable NVIDIA approves in its Spark Stacking documentation (Amphenol NJAAKK0006 / Luxshare LMTQF022-SD-R spec). Petronella Technology Group, Inc. sells it at $159 with free US shipping, in stock, shipping in 1 to 3 business days. As of August 2026, retail listings for the same NVIDIA-approved spec run $176 to $285, NVIDIA's own marketplace lists it at $99.99 but is chronically out of stock, and Amphenol's factory-direct store shows its whole QSFP112 line on backorder.
HP positions the ZGX Nano G1n as a secure, sustainable desk-side AI node, wrapping the GB10 platform in a chassis built largely from recycled aluminum and steel and aiming it at business teams that want a supercomputer-class model host next to the desk rather than in a data center. Those same teams tend to buy in pairs so a workload can span two boxes, and clustering them takes exactly one part that HP does not put in the carton. The ZGX Nano exposes NVIDIA's GB10 clustering over two QSFP112 ports on its onboard ConnectX-7 NIC.
| Cable | 0.5m QSFP112 400G passive direct-attach copper (DAC) |
| Approved spec | Amphenol NJAAKK0006 / Luxshare LMTQF022-SD-R (NVIDIA Spark Stacking docs) |
| Fits | Both QSFP112 ports on the HP ZGX Nano G1n ConnectX-7 NIC |
| Platform | NVIDIA GB10 Grace Blackwell, 128 GB LPDDR5x unified memory |
| For two ZGX Nano units | One cable |
| For a three-node ring | Three cables (switchless, each box uses both ports) |
| Price | $159, free US shipping (in stock, ships in 1 to 3 business days) |
Clustering HP ZGX Nano units: how many cables and when you need a switch
Each ZGX Nano has two QSFP112 ports, so it follows the NVIDIA-documented GB10 topology: two units link directly with one cable, and three units form a switchless ring with three cables, each box using both ports for full pairwise connectivity. Three nodes is the switchless ceiling; with only two ports per unit, four or more ZGX Nano units need a 200G-class QSFP switch. Clustering pools memory so a model too large for one 128 GB node runs across two or three boxes. It is a capacity play, not a raw speed boost, since each link runs around 25 GB/s, which is what memory-bound inference and fine-tuning on larger models needs. Because every GB10 system shares the ConnectX-7 NIC and QSFP112 spec, a ZGX Nano also clusters with a DGX Spark or any other OEM box over the same cable.