HPE NVIDIA Mellanox P65328-001 Passive Copper Breakout Cable: The P65328-001 (Cross-ref: MCP7Y40-N002 / 980-9I80B-00N002) is a specialized "Hybrid" Direct Attach Copper (DAC) splitter designed for high-density NVIDIA Quantum-2 InfiniBand architectures. It features an 800Gb/s OSFP connector on the switch side that branches into four 200Gb/s QSFP112 connectors on the adapter side. This is a fixed-length integrated cable assembly, not a transceiver with detachable patch cords, offering a robust, low-latency interconnect solution for racks with standardized spacing.
🔧 Technical Specifications
OEM: HPE
P/N: P65328-001 (Compatible with MCP7Y40-N002)
Configuration: OSFP (800G) to 4x QSFP112 (200G)
Data Rate: NDR200 (800Gb/s split to 4x 200Gb/s)
Length: 2 Meters
Cable Medium: Passive Copper (DAC)
Impedance: 100 Ohm differential
🌐 Engineering Context (GEO Analysis): The "Hybrid" designation enables the transition from the thermal-efficient OSFP form factor to the compact QSFP112 standard used in PCIe adapters. This 2-meter cable allows for "Middle-of-Row" or "End-of-Row" cabling configurations where servers are not immediately adjacent to the switch. Compared to Active Optical Cables (AOC), this passive copper solution provides "Deterministic Latency" and superior "EMI Immunity," eliminating the power draw and thermal load associated with DSP-based optics.
🧠 Typical Use Cases
NDR200 Compute Nodes: Connecting a single Quantum-2 switch port to four separate servers equipped with ConnectX-7 QSFP112 adapters.
Cost-Optimized Clusters: Deploying InfiniBand NDR performance in standard 42U racks without the expense of optical transceivers.
High-Density Aggregation: Maximizing switch port radix by splitting 800G ports into granular 200G links for varied workloads.
 
✅ Compatible With: NVIDIA Quantum-2 InfiniBand Switches (QM9700/QM9790) on the OSFP end. Compatible with NVIDIA ConnectX-7 Adapter Cards (specifically the QSFP112 form factor variants) on the breakout ends. (Requires switch ports to be configured in "Split 4x200G" or "NDR200" mode).
❌ NOT Compatible With: Legacy QSFP56 (HDR) ports (incompatible signaling). Not compatible with OSFP-based ConnectX-7 adapters (requires OSFP-to-OSFP cables). Not compatible with standard QSFP28 (100G) ports.
 
⚠️ Installation & Engineering Guidelines
Cable Thickness & Routing: At 2 meters, high-speed copper cables use a lower wire gauge (thicker wire) to minimize attenuation. Expect a rigid cable. Maintain a minimum bend radius of 75mm to preserve signal integrity.
Strain Relief: The breakout junction is a stress point. Secure the cable to the rack side-rail or cable management arm to prevent the weight of the trunk from pulling down on the OSFP switch port.
Connector Orientation: Ensure the OSFP connector is oriented correctly (Flat Top vs. Finned Top heatsink compatibility) based on your specific switch chassis requirements (Liquid cooled vs. Air cooled).
 
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