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i9-13900KF undervolt on MSI MAG Z790 TOMAHAWK WIFI

Aug 18, 20243 min read

Hardware

Main PC

Link to original

Software

BIOS

Method 1: Use Intel Default Voltages and Apply Manual Voltage Offset to Core Voltgage

Can push all the way to -0.165V without immediate crashes, but Windows Event Viewer reports WHEA errors (parity and TLB error). This occurs alongside with software freezing and display blackscreening and flickering (unstable system). The behavior is consistent regardless of whether XMP is turned on or off (other DRAM settings remain default).

Error Screenshots and Logs:

Event 19, WHEA-Logger
修正されたハードウェア エラーが発生しました。
 
コンポーネントによる報告: プロセッサ コア
エラー ソース: Corrected Machine Check
エラーの種類: Translation Lookaside Buffer Error
プロセッサ APIC ID: 1
 
詳細は、このエントリの詳細ビューに含まれています。
Event 19, WHEA-Logger
修正されたハードウェア エラーが発生しました。
 
コンポーネントによる報告: プロセッサ コア
エラー ソース: Corrected Machine Check
エラーの種類: Internal parity error
プロセッサ APIC ID: 1
 
詳細は、このエントリの詳細ビューに含まれています。

The WHEA error can be triggered randomly, even under low pressure environment (such as just Obsidian editing - Electron app). Increasing the voltage offset to -0.13V still does not solve the problem. At this point the performance is the same as Method 2.

After-note

This did not work probably because I did not set CPU Loadline Calibration accordingly.

Method 2: Leveraging MSI Lite Load Settings

Intel Micro-code 0x125

  • BIOS Version: 7D91vHC3(Beta version)
    • with Intel uCode 0x125
  • Temperature Limit: 89 C
  • Power Limit: PL1 = PL2 = 350 W (realistically always hit the temperature limit first)
  • CPU Core Ratios:
    • P0-P1: 58
    • P2-P7: 55
    • E8-E23: 43

My CPU can tolerate MSI Lite Load down to Mode 10 (higher mode number means higher voltages) with Memory XMP @5200MHz. System is stable and no WHEA error as observed in Method 1.

Effective core frequencies during Cinebench multi-core benchmarking:

  • P-Cores: 4.9 ~ 5.0 GHz
  • E-Cores: 3.9 ~ 4.0 GHz

Cinebench Multi-Core Score: 35791

Performance limited by preset 89 C temperature wall. Package power consumption ~250 W.

BIOS Configurations:

Intel Micro-code 0x129

  • BIOS Version: 7D91vHD2(Beta version)
    • with Intel uCode 0x129
  • Temperature Limit: 89 C
  • Power Limit: PL1 = PL2 = 280 W (realistically always hit the temperature limit first)
  • CPU Core Ratios:
    • P2-P3: 58
    • P1-P2, P4-P7: 55
    • E8-E23: 43

This time I mostly just applied the default settings:

  • XMP on: 5200 MT
  • CPU Lite Load: Mode 9

Graph View

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