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Resizable BAR and Smart Access Memory
DocHero Safety Disclaimer: The PC optimization, BIOS configuration, power plan tweaks, and GPU overclocking or undervolting guides provided in this course are strictly for educational purposes. DocHero and its creators are not responsible or liable for any hardware damage, system instability, data loss, software errors, or voided manufacturer warranties resulting from user modifications. Proceed cautiously and test settings step by step!
Building a Giant Doorway Between CPU and GPU!
In older computers, when the CPU wanted to transfer texture data to the graphics card VRAM, it could only send data through a tiny 256-megabyte doorway at one time.
Resizable BAR (Base Address Register) and AMD Smart Access Memory remove the tiny doorway restrictions so the CPU can access the entire GPU video memory buffer all at once!
Why Resizable BAR Increases Gaming Speed
- Direct VRAM Access: The CPU can request large game assets, textures, and geometry shaders in single parallel transfers instead of queuing multiple small transfers.
- Reduced PCIe Bus Overhead: Removes PCI Express transfer bottlenecks between system memory and GPU VRAM.
- Modern API Optimization: Modern game engines using DirectX 12 and Vulkan benefit significantly, yielding up to 15 percent higher average FPS in open-world games.
Enabling Resizable BAR Step by Step:
- Enable Motherboard BIOS Settings:
- Reboot into BIOS (press Delete key).
- Navigate to Advanced -> PCIe Configuration.
- Set Above 4G Decoding to Enabled.
- Set Re-Size BAR Support to Auto or Enabled.
- Save and Boot to Windows: Press F10 to save and exit.
- Verify in NVIDIA Control Panel or AMD Software:
- Open NVIDIA Control Panel, click System Information at bottom left.
- Look for Resizable BAR in the details list and verify it says Yes!