Previous Thread : ROG Crosshair VIII Hero (Wi-FI) BIOS Stability Settings with BIOS 4402
So, I updated to BIOS 4805 recently and immediately noticed that instability returned after the bios was flashed and I had to work to track down what the cause was. I found it to be related to the PBO Fmax Enhancer.
System Hardware:
- ROG Crosshair VIII Hero (Wi-FI) - running BIOS 4805
- AMD Ryzen 9 5950X
- CORSAIR H150I Pro AIO
- CORSAIR Vengeance RGB RT 128GB (4 x 32GB) (PC4 28800) Model CMN128GX4M4Z3600C18
- ROG Strix RTX 3090
- Samsung 990 Pro with Custom Heatsink 2TB (boot drive - other drives not listed)
- CORSAIR AX1600I Power Supply
Steps to mimic my current settings:
- Enter the BIOS > Exit Menu > Load Optimized Defaults
- Extreme Tweaker Menu
- > Overclock Tuner > D.O.C.P. > D.O.C.P. Standard (This is to get the benefit of the faster memory timings)
- > Precision Boost Overdrive > PBO Fmax Enhancer > Disabled.
- > CPU Core Voltage > Offset Mode
- >> Offset Mode Sign > +
- >> CPU Core Voltage Offset > 0.12500
- > DRAM Voltage > 1.36000 (This is because I'm using 4 sticks and it needed a touch more voltage to become stable with D.O.C.P enabled -- refer to your memory!)
- Advanced Menu > AMD CBS > CPU Common Options
- >> Global C-State Control > Disabled
- >> Power Supply Idle Control > Typical Current Idle
Other unrelated BIOS settings I have modified from default:
For Graphic Card Support:
- Resizable BAR enabled (using the control on the top righthand side of the bios setting menu)
- - You can verify this setting is enabled within the NVidia control panel.
For Windows 11 Security Support:
- Advanced Menu > CPU Configuration > SVM Mode > Enabled
- Advanced Menu > AMD fTPM > Enable Discrete or Firmware TPM -- Your choice which to use
- Boot > Secure Boot > OS Type > Windows UEFI Mode
- After boot, check the Windows Security Panel - some items may need to be toggled on and require a reboot.
- These should enable Core Isolation, Security Processor, Secure Boot, and Data Encryption for Enhanced Security.
Within windows I also run the High Performance Power Setting: Control Panel > Hardware and Sound > Power Options
Once you reach a stable setting, don't forget you can save those BIOS settings using the instructions found here: https://www.asus.com/support/FAQ/1046388/
I hope this helps others move back towards a stable system and gain the benefits of the latest BIOS update.
-Cos
