How To Verify Resizable Bar Is Enabled Properly In Your System Bios

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Resizable BAR (Base Address Register) is a feature that allows your CPU to access the entire GPU memory buffer at once, improving gaming and application performance. Ensuring it is properly enabled in your system BIOS is essential for optimal performance.

Prerequisites for Verification

  • A compatible motherboard and CPU that support Resizable BAR.
  • The latest BIOS firmware installed.
  • Updated graphics drivers that support Resizable BAR.

Steps to Verify Resizable BAR in BIOS

Follow these steps to check if Resizable BAR is enabled in your BIOS:

Access BIOS Settings

Reboot your computer and press the BIOS access key during startup. Common keys include Del, F2, or Esc. Refer to your motherboard manual for exact instructions.

Locate Resizable BAR Settings

Navigate through the BIOS menus to find settings related to PCIe or Graphics configuration. The exact location varies by manufacturer but look for options labeled:

  • Resizable BAR
  • Above 4G Decoding
  • Resize BAR Support

Enable Resizable BAR

If the setting is disabled, change it to Enabled. Also, ensure that Above 4G Decoding is enabled, as it is often required for Resizable BAR to function correctly.

Verify in Windows

After enabling in BIOS, boot into Windows to confirm the feature is active.

Use Device Manager

Open Device Manager by right-clicking the Start menu and selecting it. Expand the Display adapters section. Right-click your GPU and choose Properties. Navigate to the Details tab, then select Hardware Ids. Confirm that your GPU driver supports Resizable BAR.

Use Third-Party Tools

Tools like GPU-Z or MSI Afterburner can detect if Resizable BAR is active. Download and run these programs, then check the feature status in their interface.

Troubleshooting

If Resizable BAR is not enabled after following these steps:

  • Ensure your motherboard BIOS is updated to the latest version.
  • Verify that your CPU and GPU support Resizable BAR.
  • Double-check BIOS settings for Above 4G Decoding and Resizable BAR.
  • Update your GPU drivers to the latest version.

Consult your motherboard or GPU manufacturer’s support resources for specific instructions related to your hardware.