PCIe 4.0 x4 Male Down R/A to x1 Female Extension Cable, 85-ohm Low Impedance

The PCIe 4.0 x4 Male Down R/A to x1 Female Extension Cable, 85-ohm Low Impedance, is a high-performance passive adapter solution engineered for next-generation computing systems, data centers, and applications requiring precise impedance matching and space-optimized cable routing. This cable adapts a PCIe 4.0 x4 slot interface to a PCIe x1 interface while maintaining a consistent 85-ohm differential impedance to ensure optimal signal integrity at data rates up to 16.0 GT/s. The inclusion of a Down Right-Angle (Down R/A) male connector minimizes the vertical profile during motherboard insertion, making it ideal for low-profile chassis and densely packed enclosures. Constructed with low-loss materials and robust multi-layer shielding, this solution is designed for high-density servers, test benches, and systems requiring strict compliance with PCI-SIG standards for PCIe 4.0 implementations. The hybrid design addresses both electrical performance and mechanical routing challenges in complex environments.

Features

• 85-Ohm Impedance Matching: Precisely engineered to maintain 85-ohm differential impedance across the entire cable assembly, reducing signal reflections and ensuring compliance with PCIe 4.0 specifications for improved signal integrity in high-speed applications up to 16.0 GT/s.
• Down Right-Angle Male Connector: The Down R/A male connector facilitates low-profile insertion into motherboard slots, reducing vertical clearance requirements and preventing interference with adjacent components in space-constrained systems.
• PCIe 4.0 Compliance: Supports PCIe 4.0 specifications with a data transfer rate of 16.0 GT/s per lane, providing a bandwidth of approximately 2 GB/s for x1 configurations while ensuring backward compatibility with PCIe 3.0/2.0/1.0 devices .
• Enhanced Signal Integrity: Utilizes low-loss twin-axial cables (e.g., 31 AWG precision copper) with multi-layer shielding (foil and braid) to minimize insertion loss, crosstalk, and electromagnetic interference (EMI), ensuring stable performance even in electrically noisy environments .
• Form Factor Adaptation: Enables physical and electrical compatibility between PCIe x4 and x1 interfaces, allowing x1 devices to be installed in x4 slots with optimized space utilization and signal preservation.
• Durable Construction: Incorporates gold-plated contacts (min. 0.76µm thickness) and reinforced connector housings with strain relief to withstand mechanical stress in commercial environments, ensuring longevity and reliable performance .

Specifications

• Product Model: PCIe 4.0 x4 Male Down R/A to x1 Female Extension Cable, 85-ohm Low Impedance
• Connector A: PCIe 4.0 x4, Male, Down Right-Angle (Down R/A)
• Connector B: PCIe 4.0 x1, Female, Straight Receptacle
• Connector Gender: Male to Female
• Cable Type: Passive Copper Extension Cable
• Pinout Configuration: Standard PCIe-compliant with x4 to x1 lane mapping
• Cable Length: Standard options: 0.25m, 0.5m (Custom lengths up to 1.0m available; longer lengths require validation) 
• 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: Foil and braid shielding for comprehensive EMI protection 
• Operating Temperature: -40°C ~ 85°C (industrial grade) 
• Durability: Minimum 500 insertion cycles
• Safety Standards: RoHS compliant 

Applications

• High-Density Data Centers: Deploying in servers and storage systems where PCIe 4.0 extensions are required for add-on cards (e.g., NICs, accelerators), with the 85-ohm impedance ensuring minimal signal loss and the Down R/A design optimizing cable routing in cramped racks .
• Test and Development Benches: Facilitating hardware debugging and signal integrity validation where precise impedance matching is critical for probing PCIe 4.0 signals without introducing reflections or attenuation .
• Low-Profile Embedded Systems: Supporting custom PCIe implementations in industrial PCs or compact appliances where downward-facing cable orientation and minimal vertical clearance are essential .
• Gaming and Workstation Customization: Enabling flexible component placement in custom PC builds where motherboard x1 slots are obstructed, with the 85-ohm cable ensuring stable performance for high-speed devices like capture cards or NVMe adapters .