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13900KS stability problème with ASUS ROG STRIX Z790-F GAMING WIFI : Bios 2801, 2703, 2503...

Paladin3333
Level 7

After updating the BIOS on my ASUS ROG STRIX Z790-F GAMING WIFI motherboard from version 2402 to 2503, my Intel Core i9-13900KS processor became unstable at certain frequencies, particularly when reaching 6 GHz or higher. This instability appears to be linked to the management of AVX (Advanced Vector Extensions) loads, which place significant demands on the processor's resources.

Analysis and Cause
The management of the AVX ratio and voltage in the ASUS BIOS plays a key role. With the new BIOS versions, it is difficult to get a clear view of the actual frequencies and voltages applied during AVX loads, making it harder to precisely adjust parameters to achieve optimal stability at high frequencies.

Solution Implemented

  • Initial Stabilization: I first set the frequencies to 5.6 GHz for the P-cores and 4.3 GHz for the E-cores by locking out the 6 GHz turbo. These are their default stable values, while also reducing the AVX ratio by 1.
  • Overclocking with AVX Ratio Adjustment: I then overclocked my processor to 5.8 GHz for the P-cores and 4.4 GHz for the E-cores, while reducing the AVX ratio by -3 using the "AVX Instruction Core Ratio Negative Offset" option in the BIOS. This allowed me to stabilize the system and achieve a Cinebench R23 score of 39.5k points, which is close to the original performance.

Conclusion
However, it must be noted that my CPU can no longer sustain 6 GHz, even with the AVX ratio reduced by 4 points. This indicates that the issue persists beyond just adjusting the AVX ratio.To address these limitations, it would be ideal if ASUS BIOS provided more detailed information, including:

  • the actual AVX frequency under load.
  • The exact voltage applied to the AVX, to allow for finer and more precise adjustments.

As it stands, it remains difficult to fully exploit the processor's capabilities, even with advanced manual tuning.

 


 

 

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