This is where the bulk of your performance tuning happens. Within the Advanced tab, you will find settings for: Manage Hyper-Threading and active cores. SATA Configuration: Switch between AHCI and RAID modes.

The MR9A Pro can be picky about RAM. If you change timings and the system won't post, try booting with a single stick of RAM in the primary slot.

Useful for configuring the speed of your NVMe drives or GPU slots.

Enable or disable legacy support for older peripherals. Chipset Menu

The Machinist X99 MR9A Pro BIOS is a powerful tool for those willing to learn its quirks. While it lacks the polish of "Big 4" motherboard manufacturers, it provides the essential controls needed to turn a cheap Xeon processor into a multi-core powerhouse. Whether you are sticking to the stock settings or venturing into the world of modded BIOS files, always proceed with caution and keep a backup ready.