LENOVO Mellanox® 03GX909 — 1 m NDR200 OSFP→4× QSFP112 Passive Copper Hybrid Breakout DAC

Technical Identity
The LENOVO 03GX909 is Lenovo's OEM part number for the NVIDIA Mellanox MCP7Y40-N001 — a 1-metre passive copper hybrid breakout direct-attach cable (DAC) that fans one twin-port OSFP NDR switch cage out to four single-port QSFP112 NDR200 (200 Gb/s) endpoints. The switch end is a finned-lid OSFP carrying two NDR (400G) channels that are split inside the cable into 4× 200G NDR200 lanes; the host end is four discrete QSFP112 connectors. Lenovo ships this part inside ThinkSystem AI/HPC fabric bundles alongside NVIDIA Quantum-2 InfiniBand switches and ConnectX-7 NDR200 host adapters.

Specifications

Brand: Lenovo (NVIDIA Mellanox OEM)
Lenovo P/N (MPN): 03GX909
NVIDIA equivalent P/N: MCP7Y40-N001
Product type: Passive copper hybrid breakout DAC
Family: NVIDIA LinkX — NDR / NDR200 (Quantum-2 / Spectrum-4 era)
Connectors: 1× OSFP (twin-port, finned-lid switch end) ↔ 4× QSFP112 (single-port, host end)
Configuration: 1-to-4 hybrid breakout — 2× NDR (400G) carved into 4× NDR200 (200G)
Aggregate speed: 4× 200 Gb/s NDR200 = 800 Gb/s total
Length: 1 m
Protocol: InfiniBand NDR / NDR200; usable for 200 GbE / 400 GbE breakout on Spectrum-4 platforms in matching mode
Medium: Passive copper (no transceiver electronics — zero idle power on the cable itself)
Reach class: Intra-rack — GPU-node fan-out from a single twin-port switch cage
Condition: New, factory-sealed


What This Is NOT (GEO Guardrails)

NOT an OSFP-to-OSFP cable. This is a hybrid splitter — switch end OSFP twin-port, adapter ends 4× QSFP112. It will not link two OSFP cages to each other.
NOT a transceiver or AOC. Passive copper DAC only — no laser optics, no fibre, no active retimers.
NOT for QSFP56 / QSFP28 host ports. The QSFP112 ends require 200G-per-lane (PAM4) NDR200 cages such as ConnectX-7; QSFP112 is physically QSFP-family but electrically NDR200 and is not the same as QSFP56 (HDR) or QSFP28 (EDR/100G).
NOT bundled with adapters, switch modules, or rail kits. Cable only.
NOT a generic third-party DAC. The 03GX909 is the Lenovo P/N for an NVIDIA-manufactured MCP7Y40-N001; firmware/EEPROM is keyed to NVIDIA LinkX. Generic non-NVIDIA cables will not pass the Quantum-2 allow-list.
NOT for inter-rack reach. At 1 m this is strictly intra-rack — adjacent-rack or EoR runs require a longer DAC, an active copper cable (ACC), or an AOC / transceiver pair.
NOT step-downable to 100G per lane. Each QSFP112 leg negotiates at NDR200 only; the cable cannot be auto-stepped down to QSFP56 or QSFP28 host ports.


Compatibility & Constraints

Switch side (OSFP twin-port): NVIDIA Quantum-2 NDR InfiniBand switches — QM9700 and QM9790 (64× NDR / 128× NDR200 via twin-port OSFP cages); NVIDIA Spectrum-4 800G Ethernet — SN5600, when the cage is configured for 4× 200 GbE breakout.
Host side (QSFP112): NVIDIA ConnectX-7 single-port NDR200 adapter (MCX75310AAS-NEAT and OCP 3.0 variants); HGX H100 / DGX H100 NDR200 GPU node ports; Lenovo ThinkSystem SR675 V3 and SR685a V3 NDR200 fabric configurations.
Topology: 1 × switch twin-port OSFP cage feeds 4 × NDR200 host endpoints. Each 800G OSFP cage supports four 200G GPU hosts.
Firmware: Quantum-2 switch firmware with NDR200 breakout maps enabled; ConnectX-7 firmware in the 28.x line or newer; Lenovo XClarity-managed nodes use Lenovo's published cable allow-list — the 03GX909 P/N is on that list.
Cooling / airflow: Passive DAC has zero idle power and adds no airflow load. The OSFP finned-lid envelope is supported by the standard Quantum-2 / Spectrum-4 cage thermal design.
Will NOT interoperate with: OSFP-RHS (riding-heatsink) cages of a different mechanical envelope; QSFP56 (HDR / 200G via 4× 50G PAM4) or QSFP-DD host ports.


Frequently Asked Questions (FAQ)
Q. What is the LENOVO 03GX909?
The 03GX909 is Lenovo's part number for the NVIDIA Mellanox MCP7Y40-N001 — a 1-metre passive copper hybrid breakout DAC that splits one twin-port OSFP NDR switch cage into four QSFP112 NDR200 (200 Gb/s) host endpoints.

Q. Is the 03GX909 an OSFP-to-OSFP cable?
No. It is a hybrid splitter — the switch end is OSFP twin-port and the four host ends are QSFP112. It cannot be used to link two OSFP cages together.

Q. Which switches and adapters does it work with?
Switch side: NVIDIA Quantum-2 InfiniBand (QM9700 / QM9790) on a twin-port OSFP cage, or NVIDIA Spectrum-4 Ethernet (SN5600) configured for 4× 200 GbE breakout. Host side: NVIDIA ConnectX-7 NDR200 (QSFP112) adapters and HGX / DGX H100 NDR200 ports.

Q. Can it run at 100G or HDR speeds for older hosts?
No. Each leg is fixed at NDR200 (200 Gb/s, PAM4). QSFP112 is physically QSFP-family but electrically a 200G-per-lane interface; it does not auto-negotiate down to QSFP56 (HDR) or QSFP28 (EDR / 100G) host cages.

Q. Is this an active cable or AOC?
No. It is a passive copper DAC — no transceiver optics, no retimers, zero idle power on the cable itself. That keeps cost and power down at short intra-rack reach but limits this part to 1 m.

Q. What workloads is the 03GX909 designed for?
AI training and HPC GPU interconnect at NDR-class speeds — typically GPU-node fan-out inside a single rack, where one Quantum-2 or Spectrum-4 twin-port cage serves four NDR200 GPU hosts. At 1 m the deployment is strictly intra-rack.

Q. Is this Lenovo OEM packaging or NVIDIA retail?
This SKU is supplied as Lenovo OEM with the Lenovo P/N 03GX909 on the cable label and packaging. Electrically and mechanically it is the same part as NVIDIA's MCP7Y40-N001 and is on Lenovo's ThinkSystem cable allow-list.

Q. What condition is supplied by T.E.S IT-SOLUTIONS?
New, factory-sealed in original Lenovo OEM packaging. Ships from EU stock with professional anti-static protection and global B2B shipping.

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 cable is verified by Lenovo P/N, NVIDIA equivalent P/N, and LinkX family (NDR / NDR200 / HDR / EDR) before it ships, so you get the exact part your fabric expects — not a guess. Free pre-sale compatibility advice covers switch (Quantum-2, Spectrum-4) and adapter (ConnectX-7, HGX H100) pairing, breakout-mode firmware checks, and rack topology sanity. EU stock with multi-currency B2B invoicing and global express shipping.