X99 Mr9a Pro Bios — Machinist
| Problem | Details | Workaround | |------|------|------| | NVMe boot disappears | After CMOS reset or power loss, BIOS discards NVMe boot entry. | Reflash NVMe driver via UEFI shell or use Clover/OpenCore bootloader. | | Slow POST (30-60s) | Memory training every boot if Fast Boot disabled. | Enable Fast Boot + Memory Fast Boot (but may cause BSOD). | | Fan control resets | After sleep or reboot, custom fan curves reset to 100% PWM. | Use software like FanControl or SpeedFan in OS. | | SR-IOV/VT-d instability | Enabling IOMMU causes random PCIe device dropouts. | Keep VT-d disabled unless needed for VFIO passthrough. | | No CPU temperature on some sensors | BIOS shows 0°C or 127°C. | Ignore; use HWMonitor in OS. | | RAID not working | Despite Intel RST option, RAID volume fails on reboot. | Use software RAID (Windows Storage Spaces or mdadm). | | S3 sleep wake failure | System wakes to black screen or resets. | Use S4 (hibernate) or disable sleep entirely. |
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Machinist X99 MR9A Pro is a popular "Frankenstein" motherboard built on recycled Intel chipsets (often B85, Q87, or C226) designed to run professional Xeon E5 v3/v4
. Because its stock BIOS is often limited, many users seek "deep" modifications to unlock the hardware's full potential. 1. Key BIOS Basics Entry Key: Repeatedly press (Delete) during the initial splash screen Default Limitations: machinist x99 mr9a pro bios
The factory BIOS typically lacks memory timing controls and does not support the "Turbo Boost Unlock" for Haswell Xeons Resetting: If you mess up settings and lose display, use the Clear CMOS jumper
on the motherboard or remove the CR2032 battery for 30 seconds 2. The "Turbo Boost Unlock" Exploit
The primary reason for a "deep" BIOS dive on this board is to enable all CPU cores to run at their maximum rated turbo frequency simultaneously | Problem | Details | Workaround | |------|------|------|
MACHINIST X99-K9 Motherboard Desktop User Manual - device.report
| 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 |
The BIOS is largely identical to Huanan, Kllisre, and Jingsha X99 boards (common template). However, the MR9A Pro has specific quirks. If you want, I can:
The stock BIOS (typically version 4.6.5.4 or similar) often lacks microcode for Xeon v4 Broadwell-EP. Users must manually update microcode via:
Unlike major brands like ASUS or MSI, Machinist does not host a centralized, easy-to-find support database.
The Machinist X99 MR9A Pro is a popular choice for budget workstation and server builds. However, its BIOS is often a generic, minimally modified version of the AMI Aptio V firmware. Users frequently encounter issues such as slow POST times, limited CPU microcode, and instability with high-density DDR4 RDIMMs. Understanding the BIOS’s architecture and parameter interactions is essential for stable operation.