"Pro" likely denotes that it's a professional-grade motherboard.
The Machinist X99 MR9A Pro is a motherboard model, specifically designed for Intel Xeon E5-2600 V3/V4 series processors, and it supports up to 4-way SLI and CrossFireX. machinist x99 mr9a pro bios top
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The Machinist X99 MR9A Pro motherboard features an Intel X99 chipset and supports Intel Xeon E5-2600 V3/V4 series processors. For optimal performance, updating the BIOS to the latest version is recommended. machinist x99 mr9a pro bios top
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