Machinist X99‑MR9S Review

Machinist X99‑MR9S is a full‑size ATX motherboard launched in 2022 and positioned as a high‑end option.

Since then, several new revisions have appeared; power delivery has been improved, and TPM 2.0 support has been added. This review looks at the current version of the board and whether it’s worth considering in 2026.

Specifications

The board ships in green (a black‑and‑white variant existed earlier) and looks fairly modern. To add a more premium touch, there’s an integrated rear I/O shield, metal‑reinforced PCIe x16 slots, and onboard power and reset buttons.

The first key feature is immediately visible: eight DDR4 slots with quad‑channel support, allowing up to 256 GB of memory in a single‑socket configuration. That’s impressive—especially if you can actually leverage that much RAM.

The second highlight is one of the strongest VRMs found on Chinese X99 boards. The VRM is built around a uP1649Q PWM controller with four uP1961S drivers and uses SM4503NHKP (high‑side, 80 A/3 mΩ) and SM4508NHKP (low‑side, 49 A/6.8 mΩ) MOSFETs. It implements eight virtual phases, each with three MOSFETs: one high‑side SM4503 plus two low‑side SM4508 (doubled low side). This configuration handles top‑tier CPUs with TDPs around 145 W without trouble.

The PCIe layout also deserves attention. Although there are four full‑length slots, only two are x16 electrically; the other two are wired as x1 and x4. There is also a short x1 slot. Actual slot order (top to bottom): x1 (Gen 2.0, short), x16 (Gen 3.0), x1 (Gen 2.0, full‑length), x16 (Gen 3.0), x4 (Gen 3.0, full‑length).

Now for the drawbacks, starting with the chipset. Unlike the usual C612 found in boards of this class, this model uses Intel 8‑series desktop chipsets (typically B85/Q87) or the server‑grade C226. That helped reduce cost, but at the expense of some modern I/O. Because of the chipset choice, you only get two USB 3.0 ports; the four SATA III ports are joined by two slower SATA II ports.

The lack of a working sleep (S3) mode is unsurprising for Chinese boards, but it’s still disappointing at this price tier. Also worth noting are significantly understated CPU power‑consumption readings and middling onboard audio quality.

Revisions

The board has been in production for several years, and during this time the manufacturer has released many revisions. Unfortunately, the vendor does not maintain a public changelog, so tracking them is difficult.

At a minimum, the X99‑MR9S exists in these revisions: 1.0 / 1.2 / 2.0 / 6.0, and there may be rarer variants. Revisions 1.0 and 1.2 were produced in both green and black‑and‑white colorways, but starting with version 6.0 the board appears to ship only in green.

Early versions had a 6‑phase VRM (three MOSFETs per phase), sometimes used a simpler audio codec, featured differently shaped heatsinks, and might lack the integrated I/O shield. Over time, the VRM layout was revised, and later a revision with TPM 2.0 support was introduced. Key components (chipset family, super I/O, etc.) did not change.

Although early versions do not have a native TPM 2.0 header, they all expose an LPC header (JLPC1), so you can still install a working TPM 2.0 module. Learn more about TPM 2.0 on Chinese X99 motherboards.

Revision with TPM 2.0 support

The version with a native TPM 2.0 header corresponds to revision 6.0. Earlier revisions did not receive this update and are likely discontinued.

BIOS Capabilities

The board runs a familiar Aptio V‑based UEFI/BIOS. Unfortunately, the stock firmware isn’t ideal, and the vendor doesn’t seem particularly interested in improving it.

Regardless of revision, the stock features are the same: Secure Boot, TPM 2.0 configuration, and Above 4G Decoding are available. The stock BIOS lacks access to memory‑timing controls and Resizable BAR, but PCIe bifurcation works.

The BIOS version dated March 23, 2022 can be successfully modified using the UltimatePatcherTool. After patching, you gain Turbo‑Boost unlock, memory‑timing control, undervolting, overclocking of unlocked CPUs, and voltage controls directly in the BIOS (Overclocking Features menu). This BIOS has been successfully flashed and used at least on revisions 1.0 and 1.2.

Are BIOS images cross‑compatible between revisions?

We don’t have a definitive answer. It is known that firmware for versions 1.0 and 1.2 is interchangeable, but compatibility with later revisions is currently unknown.

Simple BIOS Flashing Guide (Windows)

Frequently Asked Questions

Which memory slots are primary, and which should be populated first?

The board won’t boot, black screen, etc. What should I do?
See our article about the most common LGA2011‑3 issues.

Where can I find drivers for this board?
The page with current drivers for socket 2011‑3 boards is located here.

Where is the BIOS chip located?
To the right of the chipset heatsink. A clip‑on programmer can be attached.

Which TPM 2.0 module is compatible with this board (revision with native TPM header)?
You need an MSI 14‑pin LPC TPM 2.0 module — for example, this one.

Conclusion

Written by

Dmitrii Sadikov

Senior Hardware Specialist proving you don't need top-tier gear to game. Expert in smart upgrades and budget-friendly PC restoration.

Published: February 13, 2026