Airtop3 application note - reducing acoustic noise
From fit-PC wiki
- This application note applies to Airtop3.
- 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
- Reboot and press F11 (not DEL) to enter advanced BIOS settings
- Advanced --> Setup items availability: Development
- Advanced --> Power and performance --> CPU - Power Management Control --> CPU VR Settings --> Acoustic noise Settings:
- Acoustic Noise Mitigation: Enabled
- Pre Wake Time: 255 (use '+' key to change)
- Ramp Up Time: 255 (use '+' key to change)
- Ramp Down Time: 255 (use '+' key to change)
- For each of the four sections below (IA VR Domain, GT VR Domain, SA VR Domain, VccIn VR Domain):
- Disable Fast PKG C State Ramp for xx Domain: TRUE
- Slow Slew Rate for GT Domain: Fast/16
- Save and Exit
Disable C-states in BIOS
- Reboot and press F11 (not DEL) to enter advanced BIOS settings
- Advanced --> Setup items availability: Development
- Advanced --> 'Power & Performance' --> 'CPU -Power Management Control' --> 'C states': 'Disabled'
- Save and Exit
Disable RC6 in BIOS
- Reboot and press F11 (not DEL) to enter advanced BIOS settings
- Advanced --> Setup items availability: Development
- 'Advanced' --> 'Power & Performance' --> 'GT - Power Management Control':
- 'RC6(Render Standby)': 'Disabled'
- 'Disable Turbo GT frequency': 'Enabled'
- Save and Exit