1. Introduction
This manual provides instructions for the installation, operation, and maintenance of the Broadcom Dual-Port 100 Gb/s QSFP56 Ethernet PCI Express 4.0 x16 Network Interface Card (NIC), model BCM957508-P2100G. This device is designed to provide high-speed network connectivity for servers and workstations requiring advanced data transfer capabilities.
2. Product Overview
The Broadcom BCM957508-P2100G is an internal network interface card featuring dual QSFP56 ports, each capable of 100 Gb/s data transfer rates. It utilizes a PCI Express 4.0 x16 interface for optimal performance and is designed for fiber optic connectivity. The card is compatible with various operating systems, including Windows, macOS, and Linux.

An image showing the Broadcom BCM957508-P2100G network interface card. The card features a green PCB, a large silver heatsink covering the main chip, and two QSFP56 ports on the bracket. The PCI Express connector is visible at the bottom.
3. Setup
3.1. System Requirements
- Available PCI Express 4.0 x16 slot (compatible with earlier PCIe generations at reduced performance).
- Compatible operating system: Windows, macOS, or Linux.
- Sufficient power supply for the system.
- Appropriate QSFP56 fiber optic transceivers and cables (not included).
3.2. Hardware Installation
- Power off your computer and disconnect the power cord.
- Open the computer case.
- Locate an available PCI Express 4.0 x16 slot on the motherboard.
- Remove the corresponding expansion slot cover from the computer case.
- Carefully insert the Broadcom NIC into the PCIe slot, ensuring it is fully seated. Secure the card with the bracket screw or retention clip.
- Close the computer case and reconnect the power cord.
- Power on your computer.
3.3. Driver Installation
Upon system startup, the operating system may automatically detect and install generic drivers. For optimal performance and full functionality, it is recommended to install the latest drivers from the official Broadcom support website. Refer to the Broadcom website for specific driver download and installation instructions for your operating system.
4. Operating Instructions
4.1. Connecting Fiber Optic Cables
- Insert compatible QSFP56 transceivers (not included) into the two QSFP56 ports on the NIC.
- Connect the appropriate fiber optic cables to the transceivers. Ensure the cables are securely connected and match the type required by your transceivers and network infrastructure.
- Connect the other end of the fiber optic cables to your network switch or other network devices.
4.2. Network Configuration
After driver installation and cable connection, configure the network settings within your operating system. This typically involves:
- Accessing network adapter settings (e.g., Network and Sharing Center in Windows, Network Preferences in macOS, network configuration tools in Linux).
- Assigning IP addresses (DHCP or static).
- Configuring advanced settings such as Jumbo Frames, VLANs, or Link Aggregation if required by your network environment.
Consult your operating system's documentation or network administrator for detailed network configuration procedures.
5. Maintenance
5.1. General Care
- Ensure adequate airflow within the computer case to prevent overheating.
- Avoid exposing the card to extreme temperatures or humidity.
- Handle the card by its edges to prevent damage to components or static discharge.
5.2. Cleaning
Periodically inspect the card for dust accumulation, especially on the heatsink. If cleaning is necessary:
- Power off the system and disconnect the power cord.
- Use compressed air to gently remove dust from the heatsink and other components.
- Do not use liquid cleaners directly on the card.
5.3. Firmware Updates
Broadcom may release firmware updates to improve performance, add features, or address issues. Check the official Broadcom support website periodically for available firmware updates and follow their instructions for safe installation.
6. Troubleshooting
6.1. Common Issues and Solutions
- No Link Light / No Network Connectivity:
- Verify that the fiber optic cables are securely connected to both the NIC and the network device.
- Ensure the QSFP56 transceivers are correctly seated and compatible.
- Check network switch port status and configuration.
- Confirm that the correct drivers are installed and updated.
- Slow Network Speed:
- Ensure the NIC is installed in a PCI Express 4.0 x16 slot for full bandwidth.
- Verify that the network infrastructure (switch, cables, transceivers) supports 100 Gb/s.
- Check for driver updates.
- Monitor CPU and memory usage on the host system.
- Driver Installation Issues:
- Download drivers directly from the Broadcom support website.
- Ensure compatibility with your operating system version.
- Temporarily disable antivirus software during driver installation if conflicts occur.
If issues persist, consult the Broadcom support website or contact technical support.
7. Specifications
| Brand | Broadcom |
| Model Number | BCM957508-P2100G |
| Connectivity Technology | Wired |
| Host Interface | PCI Express 4.0 x16 |
| Interface | Fiber (QSFP56) |
| Maximum Data Transfer Rate | 100000 Mbit/s (100 Gb/s) |
| Ports | Dual QSFP56 |
| Operating System Support | Windows, macOS, Linux |
| Compatible Devices | Desktop |
| Product Dimensions (LxWxH) | 19.69 x 19.69 x 11.02 inches |
| Item Weight | 1 pound (16 ounces) |
| UPC | 650861000291 |
8. Warranty and Support
8.1. Warranty Information
Broadcom products are covered by a limited warranty. For detailed information regarding the warranty period, terms, and conditions applicable to your BCM957508-P2100G Network Interface Card, please refer to the warranty documentation provided with your purchase or visit the official Broadcom website.
8.2. Technical Support
For technical assistance, driver downloads, firmware updates, and additional product documentation, please visit the official Broadcom support website. The website provides resources such as FAQs, knowledge bases, and contact information for customer support.





