Machinist X99 Mr9a Pro Bios Top [better] < 2024 >

This board uses a modified Intel C612 chipset (for LGA 2011-3) and is designed for Xeon E5 v3/v4 CPUs. The BIOS is typically a custom AMI Aptio V interface.

Memory Configuration (XMP Support)

The MR9A Pro supports DDR4 ECC REG memory (common with Xeons) and non-ECC Nanya/Samsung consumer chips. machinist x99 mr9a pro bios top

XMP Profiles: The board supports Intel XMP (Extreme Memory Profile). However, compatibility varies. High-speed RAM (above 2666MHz) may require manual tweaking. If XMP fails to boot, users often have to manually set the frequency and voltage.
ECC Support: The BIOS automatically recognizes ECC memory, but it usually runs in "Non-ECC" mode (no error correction) unless specifically enabled in the "Memory Configuration" sub-menu, depending on the specific BIOS revision.

Storage & SATA/NVMe

SATA Mode: AHCI recommended for single OS; RAID mode available with Intel RST if using RAID arrays.
NVMe support: UEFI NVMe boot options for M.2 and U.2 devices—ensure NVMe driver/boot priority if using multiple storage types.
Hot-plug and power management options accessible per SATA port.

3. Chipset Tab (Memory Configuration)

Memory Frequency: Set to match your DDR4 RAM's rated speed (e.g., 2133, 2400, 2666 MHz). Do not exceed CPU's official support (check your Xeon model).
DRAM Timing: Leave on Auto unless manually overclocking.
Above 4G Decoding: Enable if using multiple GPUs or modern mining/CAD setups.
Resizable BAR: Enable only if your GPU and OS support it (RTX 3000+/RX 6000+).

1. Entering the BIOS

Key: Press Del (Delete) repeatedly after powering on.
Backup BIOS: This board often has a dual BIOS. A small switch near the SATA ports lets you toggle between them if one corrupts.

B. CPU Configuration (Advanced Tab)

Hyper-Threading: Enabled (boosts multi-core).
Active Processor Cores: All (unless troubleshooting).
Hardware Prefetcher / Adjacent Cache Line Prefetch: Enabled (default).
Turbo Mode: Enabled (required for max boost clocks).