PCIe 4.0 x16 Male to x8 Female Up R/A Extension Cable

The PCIe 4.0 x16 Male to x8 Female Up R/A Extension Cable is a high-performance passive interconnect solution engineered for space-constrained next-generation systems requiring adaptive connectivity between different PCIe slot sizes while maintaining PCIe 4.0 compliance. This cable converts a larger PCIe x16 slot interface into a smaller PCIe x8 interface, supporting a data transfer rate of 16.0 GT/s per lane and delivering a total bandwidth of approximately 15.75 GB/s for the x8 configuration, with backward compatibility to PCIe 3.0/2.0/1.0 devices. The design incorporates an Up Right-Angle (Up R/A) female connector that optimizes vertical clearance by directing the cable upward relative to the motherboard plane, reducing mechanical obstruction in dense configurations such as compact workstations or servers requiring optimized space utilization. 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 ensures superior signal integrity while addressing challenging mechanical routing requirements in high-speed applications.

Features

• Form Factor Adaptation: Enables physical and electrical compatibility between PCIe x16 and x8 interfaces, allowing x8 devices (e.g., high-speed network cards or accelerators) to be installed in x16 slots while operating at x8 lane speeds.
• Up Right-Angle Connector Optimization: The Up R/A female connector facilitates upward cable routing relative to the motherboard plane, minimizing interference with adjacent components (e.g., GPUs or cooling systems) and improving airflow management in cramped enclosures.
• PCIe 4.0 Compliance: Supports PCIe 4.0 specifications with a data transfer rate of 16.0 GT/s per lane, providing approximately 15.75 GB/s bandwidth for the x8 interface.
• 85-Ohm Impedance Matching: Precisely controlled differential impedance reduces signal reflections and ensures integrity at 16.0 GT/s 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), ensuring stable performance even in electrically noisy environments.
• Passive Design: Requires no external power or active components, relying on high-quality copper conductors (e.g. as referenced in industry designs) and robust construction for plug-and-play operation.
• Durable Construction: Incorporates gold-plated contacts (e.g., min. 0.76µm thickness per 3M standards) and reinforced housings with strain relief to withstand mechanical stress in commercial or industrial environments.

Specifications

• Product Model: PCIe 4.0 x16 Male to x8 Female Up R/A Extension Cable
• Connector A: PCIe 4.0 x16, Male, Edge Connector
• Connector B: PCIe 4.0 x8, Female, Up Right-Angle (Up R/A)
• Cable Type: Passive Copper Extension Assembly
• Pinout Configuration: PCIe-compliant, mapping x16 host interface to x8 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 PCIe 4.0 low-loss applications)
• Shielding: Multi-layer 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 the Up R/A design optimizes vertical clearance for x8 add-on cards (e.g., NICs or accelerators) installed in x16 slots.
• Test and Development Benches: Facilitating hardware validation and signal integrity analysis of x8 devices in multi-slot environments, with the Up R/A connector enabling accessible probing and debugging.
• Compact Workstations: Enabling flexible component placement in small-form-factor builds where motherboard x8 slots are obstructed by larger components like GPUs or cooling solutions.
• Multi-GPU Configurations: Supporting secondary graphics cards or computational accelerators in x8 mode when the primary x16 slot is occupied.