Airtop3 application note - reducing acoustic noise

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  • With the voltage changes, the capacitors vibrate from Piezoelectric forces causing them to make audible noise.
  • The main source for this noise are from the power circuits of both the CPU and internal GPU.

Acoustic Noise Mitigation in BIOS

  1. Reboot and press F11 (not DEL) to enter advanced BIOS settings
  2. Advanced --> Setup items availability: Development
  3. Advanced --> Power and performance --> CPU - Power Management Control --> CPU VR Settings --> Acoustic noise Settings:
    1. Acoustic Noise Mitigation: Enabled
    2. Pre Wake Time: 255 (use '+' key to change)
    3. Ramp Up Time: 255 (use '+' key to change)
    4. Ramp Down Time: 255 (use '+' key to change)
    5. For each of the four sections below (IA VR Domain, GT VR Domain, SA VR Domain, VccIn VR Domain):
      1. Disable Fast PKG C State Ramp for xx Domain: TRUE
      2. Slow Slew Rate for GT Domain: Fast/16
  4. Save and Exit

Disable C-states in BIOS

  1. Reboot and press F11 (not DEL) to enter advanced BIOS settings
  2. Advanced --> Setup items availability: Development
  3. Advanced --> Power & Performance --> CPU -Power Management Control --> C states: Disabled
  4. Save and Exit

Disable RC6 in BIOS

  1. Reboot and press F11 (not DEL) to enter advanced BIOS settings
  2. Advanced --> Setup items availability: Development
  3. Advanced --> Power & Performance --> GT - Power Management Control:
  4. RC6(Render Standby): Disabled
  5. Disable Turbo GT frequency: Enabled
  6. Save and Exit