Machinist X99 Mr9a Pro Bios Portable -

If using V3 Xeons, the limit is often 2133MHz. If using V4 Xeons, you can often push to 2400MHz.

Pressing specific key combinations (e.g., Ctrl + F1 , Ctrl + F12 , or F4 within the Chipset menu) reveals hidden overclocking menus. The MR9A Pro typically includes an with: machinist x99 mr9a pro bios

Here you can adjust RAM frequency and timings. Note that many Xeon CPUs lock RAM speed to 1866MHz, 2133MHz, or 2400MHz depending on the specific processor model. If using V3 Xeons, the limit is often 2133MHz

Memory timings are completely inaccessible. If your server RAM features sloppy default JEDEC sub-timings, you are forced to run them, killing memory bandwidth and increasing latency. The MR9A Pro typically includes an with: Here

| Problem | Details | Workaround | |------|------|------| | | 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. |

Machinist boards often have aggressive fan curves. Look for the "Monitor" or "H/W Monitor" tab to manually set PWM curves for a quieter build. Safety Warning

Reboot your PC and repeatedly press the key to enter the BIOS.