What is IOMMU?

IOMMU (Input-Output Memory Management Unit) is a hardware-level security feature that safeguards your system against malicious software and helps maintain the integrity of competitive matches. Akros is introducing IOMMU as a required feature gradually. If your system requires IOMMU and it’s not enabled, the Akros Anti-cheat may display an error when starting.

⚠️ Modifying BIOS/UEFI settings carries risk. If you are unfamiliar with firmware configuration, seek assistance from a professional. Incorrect settings can affect system stability.

1) Identify Your CPU and Motherboard

1. Press the Windows key, type msinfo32, and press Enter.
2. In the System Information window, note the following:
   • Processor – identifies whether your CPU is AMD or Intel
   • BaseBoard Manufacturer and BaseBoard Product – identifies your motherboard brand and model

2) Activating IOMMU on Popular Motherboards

ASRock Motherboards

1. Press DEL during startup to enter BIOS.
2. If in Easy Mode, press F6 to switch to Advanced Mode.
3. Go to Advanced.
4. AMD CPUs:
   • Navigate to AMD CBS → NBIO Common Options
   • Set IOMMU → Enabled
   • If available, set DMA Protection and DMAr Support → Enabled
   • If available, enable Pre-boot DMA Protection and Kernel DMA Protection Indicator
5. Intel CPUs:
   • Go to Chipset Configuration
   • Enable VT-d
   • If available, set Control IOMMU Pre-boot Behavior → Enable IOMMU during boot
   • If unavailable, set Enable IOMMU → Enabled
   • If available, enable Pre-boot DMA Protection

ASUS Motherboards

1. Press DEL during system startup to enter BIOS.
2. Navigate to Advanced.
3. AMD CPUs:
   • Open AMD CBS
   • Set IOMMU → Enabled
   • If available, enable DMA Protection and DMAr Support
   • If available, enable Pre-boot DMA Protection and Kernel DMA Protection Indicator
   • You may need to open NBIO Common Options to find additional settings
4. Intel CPUs:
   • Open System Agent (SA) Configuration
   • Enable VT-d
   • Set Control IOMMU Pre-boot Behavior → Enable IOMMU during boot
   • If unavailable, set Enable IOMMU → Enabled
   • Enable Pre-boot DMA Protection if present

MSI Motherboards

1. Press DEL at startup to enter BIOS.
2. Go to OC (Overclocking) section.
3. AMD CPUs:
   • Go to Advanced CPU Configuration → AMD CBS
   • Set IOMMU → Enabled
   • If present, enable DMA Protection and DMAr Support
   • If available, enable Pre-boot DMA Protection and Kernel DMA Protection Indicator
4. Intel CPUs:
   • Go to CPU Features
   • Enable VT-d
   • Set Control IOMMU Pre-boot Behavior → Enable IOMMU during boot
   • If unavailable, set Enable IOMMU → Enabled
   • Enable Pre-boot DMA Protection
   • Enable DMA Control Guarantee if present

3) Troubleshooting

• If the IOMMU option is missing, confirm your BIOS is up to date and that CPU virtualization is enabled.
• For instructions on enabling CPU virtualization (Intel VT-x or AMD SVM), see: Enabling CPU Virtualization (Intel VT-x / AMD SVM) .
• If problems persist, consult your motherboard manufacturer's support resources for model-specific instructions on enabling IOMMU.