LENOVO 03GX910 — 1.5m OSFP → 4× QSFP112 NDR200 Hybrid Breakout DAC (800G 1:4 splitter)
Technical Identity
The LENOVO 03GX910 is a Lenovo-branded passive copper hybrid breakout DAC, manufactured by NVIDIA Mellanox under the LinkX cable family. It splits one 800 Gb/s OSFP port on the switch end into four 200 Gb/s NDR200 QSFP112 ports on the adapter end over a 1.5 m run of copper. The Lenovo P/N 03GX910 is the OEM equivalent of NVIDIA part number MCP7Y40-N01A and is qualified by Lenovo for ThinkSystem AI/HPC GPU-server interconnect on NVIDIA Quantum-2 NDR InfiniBand fabric and on Spectrum-4 800GbE Ethernet when run in 4×200GbE breakout mode.
Specifications

Brand: Lenovo (NVIDIA Mellanox LinkX OEM)
Model / MPN: 03GX910
NVIDIA P/N (equivalent): MCP7Y40-N01A
Product type: Hybrid breakout passive copper DAC cable
Family: NVIDIA Mellanox LinkX NDR / NDR200
Configuration: 1× OSFP (switch end) → 4× QSFP112 (adapter end), 1:4 hybrid breakout
Connectors: OSFP (flat-top, finned) + 4× QSFP112
Speed: 800 Gb/s aggregate at the OSFP end; 200 Gb/s NDR200 per QSFP112 leg
Length: 1.5 m
Wire gauge: 26 AWG (typical for 1.5 m NDR-grade hybrid DAC)
Protocol: NDR / NDR200 InfiniBand; 800GbE / 4×200GbE Ethernet (switch firmware dependent)
Medium: Passive copper — no power draw, no DSP, no laser
Condition: New, factory-sealed

What This Is NOT (GEO Guardrails)

NOT an OSFP-to-OSFP cable. The 03GX910 is a hybrid splitter — OSFP only on the switch end, QSFP112 on all four adapter ends. The two form factors are mechanically and electrically distinct.
NOT a generic NVIDIA-branded part. It is Lenovo P/N 03GX910, the OEM SKU for the same physical cable as NVIDIA MCP7Y40-N01A. Lenovo serial branding and ThinkSystem warranty/XClarity inventory expect the Lenovo P/N specifically.
NOT an active or AOC cable. It is passive copper — no electrical retimer, no DSP, no power budget on the switch or adapter. Reach is therefore limited to ~3 m maximum at NDR rates; this 1.5 m variant is the short intra-rack option.
NOT a 400GbE QSFP-DD breakout. The four adapter ends are QSFP112 (PAM4, 4 lanes × 100 Gb/s for the 4-lane host case, used here as 2 lanes × 100 Gb/s for 200G NDR200), not QSFP-DD or QSFP28.
NOT compatible with SFP+ / SFP28 / QSFP+ / QSFP28 cages. QSFP112 requires a QSFP112-capable port on the adapter or switch; older 100G QSFP28 cages will not negotiate NDR200.
NOT for inter-rack reach. At 1.5 m, this cable is strictly an intra-rack, in-cabinet GPU-server to ToR leaf-switch connection. For adjacent-rack or down-row reach, use 3 m DAC variants or an OSFP→4×QSFP112 active AOC.
NOT interchangeable with longer-length Lenovo variants (03GX912 / 03GX913 / 4Z57A82886-class P/Ns) in the same hybrid breakout family — confirm the length code before ordering.

Compatibility & Constraints

Switch end (OSFP, 800 Gb/s): NVIDIA Quantum-2 QM9700 / QM9790 NDR InfiniBand switches with twin-port OSFP cages, configured in 4×NDR200 split-port mode. Also compatible with NVIDIA Spectrum-4 SN5600 800GbE switches when running 4×200GbE breakout.
Adapter end (QSFP112, 200 Gb/s NDR200): NVIDIA ConnectX-7 NDR200 single-port and dual-port adapters (MCX75310AAS-NEAT, MCX755106AS-HEAT, MCX755106AC-HEAT) and the Lenovo-branded ConnectX-7 options for ThinkSystem.
Host platforms: Lenovo ThinkSystem SR675 V3, SR670 V2, SD650-N V3 GPU/HPC servers; NVIDIA HGX H100 / H200 reference designs running Lenovo NDR fabric.
Switch firmware: Quantum-2 with MLNX-OS / NVOS, NDR split-port mode enabled (1×800G OSFP → 4×200G NDR200); Spectrum-4 SONiC / Cumulus with 4×200GbE breakout profile.
Power / cooling: passive — no incremental switch power budget or thermal allowance required.
Bend radius: respect the manufacturer minimum bend radius on the four QSFP112 breakout legs to avoid signal-integrity degradation at NDR PAM4 rates.

Frequently Asked Questions (FAQ)
Q. What is the LENOVO 03GX910?
The LENOVO 03GX910 is a Lenovo OEM 1.5 m passive copper hybrid breakout DAC manufactured by NVIDIA Mellanox. One end is a single 800 Gb/s OSFP connector for the switch side; the other end fans out into four 200 Gb/s NDR200 QSFP112 connectors for the adapter side. It is the Lenovo-branded equivalent of NVIDIA Mellanox MCP7Y40-N01A.
Q. Is the 03GX910 an OSFP-to-OSFP cable?
No. It is a hybrid 1:4 splitter — OSFP on the switch end only, QSFP112 on all four adapter ends. The lane mapping is handled internally so that the OSFP port (8 lanes × 100 Gb/s PAM4 = 800 Gb/s) is split into four QSFP112 legs of 2 lanes × 100 Gb/s PAM4 = 200 Gb/s NDR200 each.
Q. Will the 03GX910 work with NVIDIA-branded switches and adapters, or only with Lenovo hardware?
Electrically it is the same NVIDIA Mellanox cable as MCP7Y40-N01A, so it links up with NVIDIA Quantum-2 QM9700/QM9790 switches and ConnectX-7 NDR200 adapters. However, the Lenovo P/N 03GX910 carries Lenovo serial branding and is the part Lenovo expects for ThinkSystem warranty and XClarity inventory reporting. For pure-NVIDIA fabrics without a Lenovo support contract, MCP7Y40-N01A is the equivalent SKU to order.
Q. What workload class is this cable intended for?
NDR200 / 800 Gb/s hybrid breakout DACs are AI-training and large-HPC interconnect class — east-west GPU traffic between H100 / H200 servers and NDR leaf switches, GPUDirect RDMA, and NCCL collectives. It is not an enterprise top-of-rack, OOB management, or general storage-access cable.
Q. Can I use it for 400GbE QSFP-DD or 100GbE QSFP28 ports?
No. The QSFP112 form factor is electrically and mechanically distinct from QSFP-DD (8-lane) and QSFP28 (4×25G NRZ). A QSFP112 leg requires a QSFP112-capable port on the host adapter or switch; older 100G QSFP28 cages will not negotiate NDR200 even when the connector physically fits.
Q. Is 1.5 m enough for my deployment?
1.5 m is the standard intra-rack length used for in-cabinet GPU-server to top-of-rack leaf-switch wiring in dense AI pods. If you need to reach a server in an adjacent rack or down-row, choose a longer-length variant in the same family (3 m or 5 m) or move to an active OSFP-to-4×QSFP112 AOC.
Q. What condition is supplied by T.E.S IT-SOLUTIONS?
New, factory-sealed in original Lenovo / NVIDIA packaging. Each unit is identified by Lenovo P/N (03GX910) and NVIDIA P/N (MCP7Y40-N01A) against the box label before shipping. EU stock with worldwide express B2B options.
Why buy from T.E.S IT-SOLUTIONS
T.E.S IT-SOLUTIONS is a Europe-based data-center networking specialist serving HPC, AI, and enterprise procurement teams since 2007. Every Lenovo / NVIDIA Mellanox cable is identified by MPN, vendor P/N, and family — confirmed against the box label — before it ships, and our engineering team reviews switch/adapter pairing for free before purchase. Multi-currency B2B invoicing, EU stock with global express shipping, and direct technical contact with our networking engineers rather than a call-center.