PCIe 4.0 x8 Male to x1 Female Extension Cable

The PCIe 4.0 x8 Male to x1 Female Extension Cable is a specialized passive interconnect solution engineered for scenarios requiring physical and electrical adaptation between different PCIe slot sizes while maintaining PCIe 4.0 compliance. This cable converts a larger PCIe x8 slot interface into a smaller PCIe x1 interface, supporting a data transfer rate of 16.0 GT/s per lane and providing a bandwidth of approximately 2 GB/s for the x1 interface, with backward compatibility to PCIe 3.0/2.0/1.0 devices. Constructed with 85-ohm impedance-matched wiring (e.g., 31 AWG low-loss twin-axial cable as referenced in 3M’s Gen 4.0 extender assemblies ) and multi-layer shielding, this cable minimizes signal degradation and ensures stable performance in high-speed applications. The design addresses form-factor adaptation needs in space-constrained environments such as test benches, compact workstations, or servers, where flexible card placement is critical without sacrificing signal integrity.

Features

• Form Factor Adaptation: Enables physical and electrical compatibility between PCIe x8 and x1 interfaces, allowing x1 devices (e.g., NICs or capture cards) to be installed in x8 slots while operating at x1 lane speeds .
• PCIe 4.0 Compliance: Supports PCIe 4.0 specifications with a data transfer rate of 16.0 GT/s per lane, leveraging high-efficiency encoding for reliable performance .
• 85-Ohm Impedance Matching: Precisely controlled differential impedance reduces signal reflections and ensures integrity at high data rates, critical for PCIe 4.0 applications .
• Enhanced Signal Integrity: Utilizes low-loss twin-axial cables with multi-layer foil and braid shielding to minimize insertion loss, crosstalk, and electromagnetic interference (EMI) .
• Passive Design: Requires no external power or active components, relying on high-quality copper conductors (e.g.) and robust construction for plug-and-play operation.
• Durable Construction: Incorporates gold-plated contacts (e.g., min. 0.76µm thickness ) and reinforced housings to withstand mechanical stress in commercial or industrial environments.

Specifications

• Product Model: PCIe 4.0 x8 Male to x1 Female Extension Cable
• Connector A: PCIe 4.0 x8, Male, Edge Connector
• Connector B: PCIe 4.0 x1, Female, Receptacle
• Cable Type: Passive Copper Extension Assembly
• Pinout Configuration: PCIe-compliant, mapping x8 host interface to x1 device lanes
• Data Rate Support: Up to 16.0 GT/s (PCIe 4.0) 
• Supported Protocols: PCI Express 4.0/3.0/2.0/1.0
• Impedance: 85 ohms differential (compliant with PCIe 4.0 standards )
• Wire Gauge: 31 AWG (high-precision copper, typical for low-loss applications )
• Shielding: Foil and braid for comprehensive EMI protection 
• Cable Length: Standard options: 0.25m, 0.5m (custom lengths up to 1.0m available; longer lengths require validation )
• Operating Temperature: -40°C to +85°C (industrial grade )
• Durability: Minimum 500 insertion cycles
• Safety Standards: RoHS compliant 

Applications

• High-Density Servers: Deploying in rack-mounted systems (e.g., 1U/2U configurations) where x1 add-on cards (e.g., NICs or controllers) need installation in x8 slots for space optimization .
• Test and Development Benches: Facilitating hardware validation and signal integrity analysis of x1 devices in multi-slot environments, enabling debugging or compatibility testing .
• Compact Workstations: Enabling flexible component placement in small-form-factor builds where motherboard x1 slots are obstructed by larger components like GPUs or cooling systems.
• Industrial and Embedded Systems: Supporting PCIe expansion in ruggedized equipment where reliable high-speed connections and form-factor adaptability are essential .