Introduction
This manual provides comprehensive instructions for the installation, operation, maintenance, and troubleshooting of your Matrox M9140 LP PCIe x16 Quad Head Graphics Card. Please read this manual thoroughly before installing and using the product to ensure proper functionality and to prevent damage.
The Matrox M9140 LP is a low-profile, PCI Express x16 graphics card designed to support up to four displays, offering 512 MB of DDR2 SDRAM. It is ideal for professional environments requiring multi-display setups.
Setup
1. Hardware Installation
Before installing the graphics card, ensure your computer is powered off and unplugged from the wall outlet. Open your computer case and locate an available PCI Express x16 slot.
- Prepare the System: Power down your computer and disconnect all cables. Open the computer case.
- Locate PCIe Slot: Identify an empty PCI Express x16 slot on your motherboard.
- Remove Slot Cover: Remove the metal slot cover from the back of the computer case corresponding to the chosen PCIe slot.
- Insert Graphics Card: Carefully align the Matrox M9140 LP graphics card with the PCIe x16 slot. Apply even pressure to both ends of the card until it is firmly seated in the slot. A click may be heard.
- Secure the Card: Secure the graphics card to the computer case using the screw or retention clip provided with your case.
- Close Case: Close the computer case and reconnect all cables.

Image: The Matrox M9140 LP PCIe x16 Quad Head Graphics Card. This image shows the green PCB, the large black heatsink covering the GPU, and the DVI output port on the left. The PCIe connector is visible at the bottom.
2. Driver Installation
After hardware installation, you must install the appropriate drivers for the graphics card to function correctly.
- Power On: Power on your computer. The system may boot into a low-resolution display mode.
- Download Drivers: Visit the official Matrox website (www.matrox.com/graphics/en/support/drivers/) and navigate to the support section for the M9140 LP. Download the latest drivers compatible with your operating system (e.g., Windows 10, Linux).
- Install Drivers: Run the downloaded driver installer and follow the on-screen prompts. You may need to restart your computer after installation.
- Verify Installation: After restarting, check your operating system's Device Manager (Windows) or display settings to confirm that the Matrox M9140 LP is recognized and functioning correctly.
Operating the Graphics Card
1. Connecting Displays
The Matrox M9140 LP supports up to four displays. Use DVI-to-VGA or DVI-to-DVI cables as needed to connect your monitors to the card's output ports.
- Ensure all displays are powered off before connecting cables.
- Connect one end of the display cable to the graphics card's DVI port and the other end to your monitor's input port.
- Power on your monitors, then power on your computer.
2. Configuring Display Settings
Once drivers are installed and displays are connected, you can configure your display settings through your operating system.
- Windows: Right-click on the desktop and select "Display settings" or "Screen resolution." Here you can arrange your displays, set resolutions (up to 1920 x 1200 per output), and choose display modes (e.g., extended desktop, duplicate displays).
- Matrox PowerDesk: Matrox provides its own display management software, PowerDesk, which offers advanced configuration options for multi-display setups. Refer to the Matrox website for PowerDesk documentation.
Maintenance
Proper maintenance ensures the longevity and optimal performance of your graphics card.
- Keep Drivers Updated: Regularly check the Matrox website for the latest driver updates. Updated drivers can improve performance, stability, and compatibility.
- Ensure Proper Airflow: Make sure your computer case has adequate ventilation to prevent the graphics card from overheating. Keep the area around your computer clear of obstructions.
- Clean Dust: Periodically clean dust from inside your computer case, especially from the graphics card's heatsink. Use compressed air for this purpose, ensuring the system is powered off.
- Avoid Physical Stress: Handle the graphics card carefully during installation or removal. Avoid bending or applying excessive force to the PCB or connectors.
Troubleshooting
This section addresses common issues you might encounter with your Matrox M9140 LP graphics card.
- No Display Output:
- Ensure the graphics card is fully seated in the PCIe slot.
- Verify that display cables are securely connected to both the card and the monitors.
- Check if the monitors are powered on and set to the correct input source.
- Try booting with only one monitor connected.
- If you recently upgraded your OS, ensure you have the correct drivers for that OS from the Matrox website.
- Incorrect Resolution or Display Issues:
- Install the latest Matrox drivers for your operating system.
- Adjust display settings in your operating system or using Matrox PowerDesk.
- Ensure your monitors support the desired resolution.
- System Instability or Crashes:
- Ensure the graphics card is receiving adequate power (though this model is low-power, check PSU stability).
- Check for overheating. Ensure proper airflow and clean any dust from the heatsink.
- Update or reinstall graphics drivers.
- Verify that your motherboard BIOS is up to date.
- Only One or Two Displays Detected:
- Confirm all display cables are connected properly.
- Check display settings in your operating system to ensure all connected displays are enabled and configured for extended desktop or other multi-monitor modes.
- Refer to Matrox PowerDesk documentation for advanced multi-display configurations.
Specifications
Below are the technical specifications for the Matrox M9140 LP PCIe x16 Quad Head Graphics Card.
| Feature | Detail |
|---|---|
| Model Number | M9140-E512LAF |
| Graphics Processor | Matrox |
| Interface | PCI Express x16 |
| Video Memory | 512 MB DDR2 SDRAM |
| Max Screen Resolution | 1920 x 1200 (per output) |
| Video Output Interface | DVI, VGA (via adapters) |
| Number of Displays Supported | Up to 4 |
| Form Factor | Low Profile |
| Item Weight | 1.72 pounds |
| Product Dimensions (LxWxH) | 6.61 x 0.75 x 2.72 inches |
| OpenGL Support | OpenGL 2.0 |
Warranty and Support
For warranty information and technical support, please refer to the official Matrox website or contact Matrox customer service directly. Warranty terms may vary by region and retailer.
Matrox Support Website: www.matrox.com/graphics/en/support/





