Top [2021]: Machinist X99 Mr9a Pro Bios
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.
Troubleshooting Common BIOS Issues on Machinist X99 MR9A Pro
| Problem | Likely Fix |
|---------|-------------|
| No POST / Black screen | Clear CMOS (jumper or remove battery for 5 mins). Boot with minimal RAM (1 stick in slot A1). |
| BIOS doesn't detect NVMe SSD | Enable Above 4G Decoding and set CSM to UEFI only. Some NVMe drives need manual PCIe link speed set to Auto. |
| RAM showing half speed | Go to Chipset → set Memory Frequency manually. Xeon v3 supports up to 2133 MHz; v4 supports 2400 MHz max (usually). |
| Fans run full speed always | Adjust in Hardware Monitor → Smart Fan → set to PWM or DC based on fan type. |
| BIOS update needed? | Only if stability is broken. Machinist rarely provides updates. Contact seller for a beta BIOS. Never flash from unknown sources. | machinist x99 mr9a pro bios top
The "USB Top" Myth
Some sellers advertise a "Machinist X99 MR9A Pro BIOS Top USB" – this is usually a flash drive pre-loaded with a custom BIOS and Windows installation files. Do not pay extra for this. You can create one yourself by downloading the Rufus tool and the official ISO for Windows 10 (or 11 with bypass), then dragging the MR9A_TOP.bin file onto the drive. This board uses a modified Intel C612 chipset
1. User Interface and Navigation
The MR9A Pro utilizes a text-based BIOS interface typical of generic Chinese X99 boards. It does not feature the modern, graphical UEFI environments found on premium brands like ASUS or MSI. Instead, users navigate via keyboard arrows and the Enter key. Troubleshooting Common BIOS Issues on Machinist X99 MR9A
- Layout: The BIOS is divided into standard tabs such as Main, Advanced, Chipset, Boot, and Security.
- Color Scheme: The background is typically blue/gray with white text, resembling legacy AMI BIOS layouts.
- Navigation: While functional, the navigation can be sluggish. USB keyboard support is generally good, but legacy USB support must sometimes be enabled if inputs are not recognized during POST.
2. Advanced > PCI Subsystem Settings
- Above 4G Decoding: Enable this for crypto mining or multi-GPU.
- Re-Size BAR Support: Enable this. This is the #1 reason to get the Top BIOS. It allows your RTX 3060/4060 or RX 6000-series GPU to utilize full memory mapping, gaining 5-10% FPS in modern games.
7. Warning: Missing / Misleading Options
- There is no Load-Line Calibration (LLC).
- CPU multiplier adjustment is ignored on non-K/Xeon CPUs.
- Resizable BAR may not work despite "Above 4G Decoding" – depends on GPU and BIOS revision.
If your BIOS layout differs (e.g., green or blue background instead of gray), you have an older revision. The same logic applies, but menus are rearranged.
Would you like a step-by-step for overclocking DDR4 memory timings on this board, or a CMOS reset guide with photos?
Accessing the BIOS
- Key: Press
Delete(Del) repeatedly during system startup. - Fallback: If Del doesn't work, try
F2orF10.