1. Introduction
This manual provides comprehensive instructions for the installation, operation, and maintenance of the Generic PCIe x16 to Two SlimSAS SFF-8654 8i Adapter, model XIC PE4165-4I. This adapter is designed to connect NVMe SSDs or other PCIe devices via SlimSAS (SFF-8654) connectors, leveraging PCIe 4.0 U.2 SSD technology. Please read this manual thoroughly before installation and use to ensure proper functionality and safety.
2. Product Overview
The XIC PE4165-4I is a high-performance interface conversion card designed for modern storage solutions. It features two SlimSAS (SFF-8654) 8i connectors, enabling connection to U.2 NVMe SSDs or other compatible devices. The card supports PCIe 4.0 and requires motherboard CPU and BIOS support for bifurcation to achieve optimal performance with multiple NVMe SSDs.
Key Features:
- Direct connection to PCIe 4.0 U.2 NVMe SSDs via SFF-8654 8i to 2x SFF-8639 cables.
- Supports bifurcation in quad x4 data link width configuration (requires CPU and BIOS support).
- Supports bifurcation in two x8 data link width configuration (requires CPU and BIOS support).
- Equipped with two SlimSAS (SFF-8654) 8i connectors, pin-out defined by SFF-9402.
- Includes both full-profile and low-profile brackets for versatile installation.

Figure 2.1: Top view of the XIC PE4165-4I adapter, showing the two SlimSAS connectors and PCIe interface.

Figure 2.2: Angled view of the XIC PE4165-4I adapter, highlighting the full-profile bracket and connector layout.
3. Setup and Installation
3.1 System Requirements
- Available PCIe x16 slot (compatible with PCIe 4.0 for full bandwidth).
- Motherboard with CPU and BIOS supporting PCIe bifurcation (x8/x8 or x4/x4/x4/x4) for multiple NVMe SSDs.
- Compatible operating system: Windows, macOS, Linux.
- Appropriate SlimSAS 8i cables (e.g., SFF-8654 8i to 2x SFF-8639 for U.2 NVMe SSDs).
3.2 Hardware Installation
- Power Off System: Ensure your computer is completely powered off and disconnected from the power source.
- Open Computer Case: Remove the side panel of your computer case to access the motherboard.
- Locate PCIe Slot: Identify an available PCIe x16 slot on your motherboard.
- Install Adapter: Carefully insert the XIC PE4165-4I adapter into the PCIe x16 slot, ensuring it is seated firmly. Secure the adapter with the bracket screw. If using a small form factor computer, replace the pre-installed full-profile bracket with the included low-profile bracket before installation.
- Connect Cables: Connect the appropriate SlimSAS 8i cables from the adapter's SFF-8654 ports to your U.2 NVMe SSDs or other compatible devices.
- Close Case and Power On: Replace the computer case side panel and reconnect the power. Power on your system.

Figure 3.1: Front view of the XIC PE4165-4I adapter, showing the full-profile bracket and PCIe edge connector.
3.3 BIOS Configuration (Bifurcation)
For optimal performance with multiple NVMe SSDs, your motherboard's BIOS must support PCIe bifurcation. Refer to your motherboard's manual for specific instructions on how to enable this feature. Typically, you will need to navigate to the PCIe slot configuration settings and set the x16 slot to bifurcate into x8/x8 or x4/x4/x4/x4 mode, depending on your setup and the number of connected devices.
4. Operating Instructions
Once the adapter is physically installed and the system is powered on, the operating system (Windows, macOS, or Linux) should detect the connected NVMe SSDs or other PCIe devices. No specific drivers are typically required for the adapter itself, as it functions as a pass-through for PCIe lanes. However, ensure your operating system has the necessary drivers for the connected NVMe SSDs.
4.1 Drive Initialization
New NVMe SSDs will need to be initialized and formatted before they can be used. This process is performed within your operating system's disk management utility:
- Windows: Open "Disk Management," locate the unallocated drive, initialize it (GPT recommended), and create new simple volumes.
- macOS: Use "Disk Utility" to erase and format the new drive.
- Linux: Use tools like
fdisk,gparted, orpartedto partition and format the drive.
5. Maintenance
The XIC PE4165-4I adapter is a passive device and requires minimal maintenance. Regular computer maintenance practices are sufficient to ensure its longevity and performance.
- Dust Removal: Periodically clean the interior of your computer case to prevent dust buildup on the adapter and other components, which can hinder airflow and heat dissipation. Use compressed air for this purpose.
- Firmware Updates: The adapter itself does not typically have user-updatable firmware. Ensure your motherboard BIOS and NVMe SSD firmware are kept up-to-date for optimal compatibility and performance.
- Cable Connections: Ensure all SlimSAS cables are securely connected to prevent intermittent issues.
6. Troubleshooting
If you encounter issues with the XIC PE4165-4I adapter, refer to the following troubleshooting steps:
| Problem | Possible Cause | Solution |
|---|---|---|
| NVMe SSDs not detected. |
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| Slow performance from NVMe SSDs. |
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| System instability after installation. |
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7. Specifications
| Feature | Detail |
|---|---|
| Model Number | XIC PE4165-4I |
| Host Bus Type | PCI Express x16 (PCIe 4.0 compatible) |
| Device Connectors | 2 x SFF-8654 (74 Pin, x8 PCIe Gen 4) |
| Compatible Device Type | U.2 (PCIe_NVMe SSD, SFF-8639), SAS SSD |
| Operating System Support | Windows, macOS, Linux |
| Bifurcation Support | Quad x4 data link width, Two x8 data link width (requires CPU & BIOS support) |
| Included Brackets | Full-profile (pre-installed), Low-profile |
| Optional Cables (not included) | Slim SAS 8i to 2x SFF-8639 Cable, Slim SAS 8i to Slim SAS 8i Cable, Slim SAS 8i to 2x Slim SAS 4i Cable |
8. Warranty and Support
For warranty information and technical support, please refer to the documentation provided with your purchase or contact your retailer. Keep your proof of purchase for warranty claims.