Resizable BAR can boost gaming performance by allowing the CPU to access the full GPU memory. This guide explains how to enable or disable it step by step.
What is Resizable BAR?
Resizable BAR (Base Address Register) is a feature that lets the CPU access the entire GPU memory at once. This can improve performance in certain games and applications, especially on modern GPUs and motherboards.
Steps to Enable or Disable Resizable BAR
1. Enter BIOS
- Restart your PC and press the appropriate key (usually DEL, F2, or ESC) during startup.
- If you are in Easy Mode, switch to Advanced Mode by clicking Advanced Mode or pressing F7.
2. Disable CSM (Compatibility Support Module)
- Go to the Boot tab in BIOS.
- Disable CSM to ensure UEFI mode is active.
3. Enable Above 4G Decoding
- Navigate to Advanced → PCI Subsystem Settings.
- Enable Above 4G Decoding. This is required for Resizable BAR.
4. Enable or Disable Resizable BAR
- In the same Advanced → PCI Subsystem Settings menu, locate Resizable BAR Support.
- The option may appear as Re-Size BAR, Smart Access Memory, or Clever Access Memory.
- Set it to Enabled or Disabled depending on your preference.
5. Save and Exit
- Go to the Exit tab and select Save Changes and Reset, or press F10.
Compatibility Requirements
Ensure your GPU, CPU, chipset, motherboard, and drivers support Resizable BAR before enabling it.
Supported GPUs
- NVIDIA: Supported on GeForce RTX 30 Series and newer. A firmware update may be required.
- AMD: Supported on RDNA 2 GPUs and newer, branded as Smart Access Memory.
- Intel: Intel Arc GPUs rely on Resizable BAR for optimal performance.
By following these steps, you can easily enable or disable Resizable BAR in your BIOS. This feature can enhance gaming performance when supported by your hardware.
Tags
Firmware