# Bios Settings

### BIOS Settings for DMA Cards: <a href="#bios-settings-for-dma-cards-intel-vs-amd" id="bios-settings-for-dma-cards-intel-vs-amd"></a>

To enable Direct Memory Access (DMA) and maximize speed and stability with your DMA card, follow the appropriate guide for your platform.

### Intel Systems <a href="#intel-systems" id="intel-systems"></a>

### 1. Disable Virtualization Features

* **VT-d:** Disable\
  (Usually found under *Advanced > System Agent Configuration > VT-d* or similar)
* **Intel Virtualization Technology:** Disable\
  (Usually found under *Advanced > CPU Configuration > Intel Virtualization Technology*)

### 2. Set PCIe Slot Speed

* **PCIe Slot Speed:** Set to **Gen1** for maximum compatibility.\
  If your DMA card and software support higher speeds, you may try **Gen2** or **Gen3** for increased bandwidth.\
  (Look under *Advanced > PCI Subsystem Settings* or similar)

### 3. Disable Security and Fast Boot Features

* **Kernel DMA Protection:** Disable\
  (Often under *Security* or *Advanced > System Configuration*)
* **Secure Boot:** Disable\
  (Found under *Boot > Secure Boot*)
* **Fast Boot/Quick Start:** Disable\
  (Found under *Boot > Boot Configuration*)
* **NX/XD Bit:** Disable if available\
  (Found under *Advanced > CPU Configuration > Execute Disable Bit*)

### 4. Enable Compatibility Support Module (CSM) *(if needed)*

* **CSM:** Enable if you encounter device initialization issues\
  (Found under *Boot > CSM*)

### 5. Update BIOS

* **BIOS Version:** Ensure your motherboard BIOS is up to date for best compatibility.

### AMD Systems <a href="#amd-systems" id="amd-systems"></a>

### 1. Disable Virtualization Features

* **SVM (Secure Virtual Machine):** Disable\
  (Found under *Advanced > CPU Configuration > SVM Mode*)
* **IOMMU:** Disable\
  (Found under *Advanced > AMD CBS > NBIO Common Options > NB Configuration > IOMMU*)

### 2. Set PCIe Slot Speed

* **PCIe Slot Speed:** Set to **Gen1** for maximum compatibility.\
  You may try **Gen2** or **Gen3** for higher speeds if your card supports it.\
  (Look under *Advanced > PCI Subsystem Settings*)

### 3. Disable Security and Fast Boot Features

* **Kernel DMA Protection:** Disable\
  (Often under *Security* or *Advanced > System Configuration*)
* **Secure Boot:** Disable\
  (Found under *Boot > Secure Boot*)
* **Fast Boot/Quick Start:** Disable\
  (Found under *Boot > Boot Configuration*)
* **NX Bit:** Disable if available\
  (Found under *Advanced > CPU Configuration > NX Mode*)

### 4. Optimize Memory and CPU Settings *(Advanced/Optional)*

* **Memory Speed:** Set to the maximum supported by your system and DIMMs.
* **Memory Interleaving:** Enable for best bandwidth.
* **Hardware Prefetchers:** Enable.
* **Core Performance Boost:** Enable for optimal CPU performance.

### 5. PCIe Write and Cache Settings *(Advanced/Optional)*

* **PCIe Allocating Write:** Set to **Non Allocating Write** if available.
* **IO Directory Cache:** Enable if available.

### 6. Enable Compatibility Support Module (CSM) *(if needed)*

* **CSM:** Enable if you encounter device initialization issues.

### 7. Update BIOS

* **BIOS Version:** Ensure your motherboard BIOS is up to date for best compatibility.

### Quick Reference Table <a href="#quick-reference-table" id="quick-reference-table"></a>

| Setting                         | Intel Recommendation           | AMD Recommendation             |
| ------------------------------- | ------------------------------ | ------------------------------ |
| Virtualization (VT-d/SVM/IOMMU) | Disable                        | Disable                        |
| PCIe Slot Speed                 | Gen1 (try Gen2/Gen3 for speed) | Gen1 (try Gen2/Gen3 for speed) |
| Kernel DMA Protection           | Disable                        | Disable                        |
| Secure Boot                     | Disable                        | Disable                        |
| Fast Boot/Quick Start           | Disable                        | Disable                        |
| NX/XD Bit                       | Disable if available           | Disable if available           |
| CSM                             | Enable if needed               | Enable if needed               |
| Memory Speed/Interleaving       | N/A                            | Max supported, enable          |
| PCIe Write/Cache                | N/A                            | Non Allocating Write, enable   |
| BIOS Version                    | Latest                         | Latest                         |


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