How to Fix: Error allocating Mem BAR for PCI Device 0X/00/0
Error allocating Mem BAR for PCI device 0X/00/0 on Dell Precision 390
📋 Table of Contents
The error 'Error allocating Mem BAR for PCI device 0x04/00/0' is a common issue that affects users of Dell systems, particularly those with multiple video cards installed. This error occurs when the system is unable to allocate memory for the Video Acceleration (VA) BAR in the PCI configuration space. The VA BAR is used to share resources between the GPU and other devices on the same bus, which can lead to conflicts if not managed properly. In this guide, we will walk you through the steps to resolve this issue.
Resolving this error can be frustrating as it may cause system instability or prevent certain features from functioning correctly. However, by following the steps outlined in this guide, you should be able to identify and fix the root cause of the problem.
🔍 Why This Happens
- The primary reason for this error is a conflict between the two video cards installed on your Dell Precision 390. When both cards are plugged in, they may compete for resources in the PCI configuration space, leading to an allocation failure. This can be caused by various factors such as incorrect BIOS settings, incompatible drivers, or issues with the video card itself.
- An alternative cause could be a problem with the system's memory management or a faulty graphics driver.
🔧 Proven Troubleshooting Steps
Resetting the PCI configuration space and updating the BIOS
- Step 1: Step 1: Boot your system in safe mode by pressing F8 during boot-up. This will load the minimal set of drivers required to display a login screen.
- Step 2: Step 2: Open the Device Manager (Press Windows key + X and select Device Manager). Expand the 'Display Adapters' section and right-click on each video card device. Select 'Uninstall device' for both cards.
- Step 3: Step 3: Restart your system and enter the BIOS setup by pressing F2 or F12 during boot-up. Set the boot order to prioritize the first hard drive, save changes, and exit the BIOS setup.
- Step 4: Step 4: Update your BIOS to the latest version using a USB drive or CD/DVD. You can download the update from Dell's website or check for updates in the BIOS settings.
- Step 5: Step 5: After updating the BIOS, restart your system and install the graphics drivers for both video cards. Make sure to select 'Update driver' in the Device Manager to search for and install any missing or outdated drivers.
Disabling the secondary video card and using the primary one
- Step 1: Step 1: Disable the secondary video card by right-clicking on it in the Device Manager and selecting 'Disable device'.
- Step 2: Step 2: Restart your system and ensure that the primary video card is recognized as the sole graphics device. You can do this by checking the display settings or using a tool like GPU-Z to verify the primary card's status.
✨ Wrapping Up
By following these steps, you should be able to resolve the 'Error allocating Mem BAR for PCI device 0x04/00/0' issue and ensure that your Dell Precision 390 system is running smoothly. If you are still experiencing issues after trying both methods, it may be necessary to seek further assistance from a qualified IT professional or Dell support.
❓ Frequently Asked Questions
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