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Machinist X99 Mr9a Pro | Bios =link=

This board is part of the "no-name" Chinese X99 ecosystem, built around recycled Intel C612 chipsets (often from server pulls). The BIOS is therefore a modified server/workstation BIOS repurposed for enthusiast, Xeon E5 v3/v4, and DDR4 overclocking/tuning.

Save & Exit

  • Save Changes, Discard, Load Optimized Defaults (use after BIOS update).
  • UEFI Flash Utility: For updating via USB FAT32 drive.

2. How to Update the BIOS

Do not use Windows-based flash tools if you can avoid them; they carry a higher risk of bricking the board. Use the BIOS built-in flash tool.

Tools Required: A USB stick formatted to FAT32 (MBR partition scheme). machinist x99 mr9a pro bios

The Process:

  1. Download the BIOS file (usually a .bin, .cap, or .rom file).
  2. Rename the file. Machinist boards usually require the file to be named specifically (e.g., mr9a.rom or simply the default name provided in the download). Check the readme file in the download.
  3. Plug the USB into the designated BIOS USB port (often a specific USB 2.0 port on the rear I/O, sometimes labeled "BIOS").
  4. Enter the BIOS (Press Del/F2).
  5. Navigate to the Save & Exit or Tool tab.
  6. Select "Q-Flash", "Instant Flash", or "M-Flash" (the name varies by BIOS version).
  7. Select the file from the USB drive and confirm.
  8. Do not turn off the PC until it reboots itself.

3.3 Hidden BIOS Menus (Critical for Advanced Users)

Pressing specific key combinations (e.g., Ctrl + F1, Ctrl + F12, or F4 within the Chipset menu) reveals hidden overclocking menus. The MR9A Pro typically includes an “Overclocking Performance Menu” with: This board is part of the "no-name" Chinese

  • BCLK Frequency: 100–125 MHz (rarely stable above 103 MHz).
  • CPU Core Voltage (Offset mode): Range +0 mV to +250 mV.
  • DRAM Voltage: 1.20V–1.45V (default 1.20V for DDR4).
  • PCH Core Voltage: Not adjustable (locked).

⚠ Warning: No VRM thermal monitoring. Overvolting can damage low-phase power delivery.

Crucial BIOS Limitations & "Features" to watch for

  • No Boot Guard: This is actually a "feature" for hackintosh or Windows 7 users (allows legacy OS installs).
  • No ReBAR (Resizable BAR): Do not expect this. If it appears, it is non-functional.
  • Slow Boot Time: Due to memory training on the AMI X99 reference BIOS, first boot takes 30-60 seconds.
  • BIOS Flash Method: Usually requires a CH341A programmer if you brick it. "Firmware update via USB" is hit-or-miss.

BIOS Update Best Practices

  • Use vendor-provided flashing tool and follow model-specific instructions.
  • Update only when necessary (compatibility fixes, microcode, stability).
  • Keep UPS or reliable power during flash; avoid interrupting update.
  • Back up current BIOS profile/settings before flashing.

Introduction

The Machinist X99 MR9A Pro is a popular budget motherboard for enthusiasts looking to build a high-core-count workstation or gaming rig using older Xeon processors (Haswell-E/Broadwell-E). However, because these boards originate from smaller Chinese manufacturers, the BIOS is often the most confusing aspect for new users. It can be unstable, lack optimization, or lack support for certain CPUs. Save & Exit

This write-up covers where to find the BIOS, how to update it safely, critical settings for stability, and solutions to common bugs.

3.1 Advanced Tab

| Submenu | Critical Settings | Recommended Value | | :--- | :--- | :--- | | ACPI Settings | Enable Hibernation | Disabled (for servers) | | CPU Configuration | Hyper-Threading, VT-x, VT-d | All Enabled | | NVIDIA RC (ReBAR) | Resizable BAR | Enable (if using GTX 10xx+) | | USB Configuration | XHCI Hand-off | Enabled | | CSM Configuration | Boot from PCIe NVMe | Legacy + UEFI |

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