i9 BIOS
Leo-Patch 1.6 · Q1HY MoDT · Observations 14 October 2026

CPU, Power, Memory

Acoustic Noise Settings

Acoustic Noise Settings firmware setup page decoded from AMI HII/IFR resources.

Form ID
0x2763
Records
9
Parents
CPU VR Settings
Path
Setup / Advanced / Power & Performance / CPU - Power Management Control / CPU VR Settings / Acoustic Noise Settings / Setup / Advanced / Advanced / Power & Performance / CPU - Power Management Control / CPU VR Settings / Acoustic Noise Settings

Record 816

Acoustic Noise Mitigation

Firmware Value

Enabling this option will help mitigate acoustic noise on certain SKUs when the CPU is in deeper C state

Form
Acoustic Noise Settings
Opcode
OneOf
Question ID
0x2d1
VarStore
CpuSetup
VarStore GUID
B08F97FF-E6E8-4193-A997-5E9E9B0ADB32
Offset
0x1fc
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0DisabledStandard defaultManufacturing default
1Enabled

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Record 817

Pre Wake Time

Firmware Value

Set the maximum Pre Wake randomization time in micro ticks.

Firmware help text

Set the maximum Pre Wake randomization time in micro ticks. Range is 0-255. This is for acoustic noise mitigation Dynamic Perodicity Alteration (DPA) tuning.

Form
Acoustic Noise Settings
Opcode
Numeric
Question ID
0x2d2
VarStore
CpuSetup
VarStore GUID
B08F97FF-E6E8-4193-A997-5E9E9B0ADB32
Offset
0x2d9
Width
1 byte(s)
Range
0 to 255 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 310, "type": "GrayOutIf", "offset": 350381, "expr": ["EqIdVal QuestionId: 0x2D1, Value: 0x0"]}

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Record 818

Ramp Up Time

Firmware Value

Set the maximum Ramp Up randomization time in micro ticks.

Firmware help text

Set the maximum Ramp Up randomization time in micro ticks. Range is 0-255. This is for acoustic noise mitigation Dynamic Perodicity Alteration (DPA) tuning.

Form
Acoustic Noise Settings
Opcode
Numeric
Question ID
0x2d3
VarStore
CpuSetup
VarStore GUID
B08F97FF-E6E8-4193-A997-5E9E9B0ADB32
Offset
0x2da
Width
1 byte(s)
Range
0 to 255 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 310, "type": "GrayOutIf", "offset": 350381, "expr": ["EqIdVal QuestionId: 0x2D1, Value: 0x0"]}

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Record 819

Ramp Down Time

Firmware Value

Set the maximum Ramp Down randomization time in micro ticks.

Firmware help text

Set the maximum Ramp Down randomization time in micro ticks. Range is 0-255. This is for acoustic noise mitigation Dynamic Perodicity Alteration (DPA) tuning.

Form
Acoustic Noise Settings
Opcode
Numeric
Question ID
0x2d4
VarStore
CpuSetup
VarStore GUID
B08F97FF-E6E8-4193-A997-5E9E9B0ADB32
Offset
0x2db
Width
1 byte(s)
Range
0 to 255 step 1

Default store records

Store IDStore labelValueOption label
0Standard0

Visibility / conditions

  • {"condition_id": 310, "type": "GrayOutIf", "offset": 350381, "expr": ["EqIdVal QuestionId: 0x2D1, Value: 0x0"]}

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Record 820

Disable Fast PKG C State Ramp for IA Domain

Firmware Value

This option needs to be configured to reduce acoustic noise during deeper C states.

Firmware help text

This option needs to be configured to reduce acoustic noise during deeper C states. False: Don't disable Fast ramp during deeper C states; True: Disable Fast ramp during deeper C state

Form
Acoustic Noise Settings
Opcode
OneOf
Question ID
0x2d5
VarStore
CpuSetup
VarStore GUID
B08F97FF-E6E8-4193-A997-5E9E9B0ADB32
Offset
0x1fd
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0FALSEStandard defaultManufacturing default
1TRUE

Visibility / conditions

  • {"condition_id": 310, "type": "GrayOutIf", "offset": 350381, "expr": ["EqIdVal QuestionId: 0x2D1, Value: 0x0"]}

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Record 821

Slow Slew Rate for IA Domain

Firmware Value

Set VR IA Slow Slew Rate for Deep Package C State ramp time; Slow slew rate equals to Fast divided by number, the number is 2, 4, 8, 16 to slow down the slew rate to help minimize acoustic noise

Form
Acoustic Noise Settings
Opcode
OneOf
Question ID
0x2d6
VarStore
CpuSetup
VarStore GUID
B08F97FF-E6E8-4193-A997-5E9E9B0ADB32
Offset
0x202
Width
1 byte(s)
Range
0 to 3 step 0
ValueLabelMarkers
0Fast/2Standard defaultManufacturing default
1Fast/4
2Fast/8
3Fast/16

Visibility / conditions

  • {"condition_id": 310, "type": "GrayOutIf", "offset": 350381, "expr": ["EqIdVal QuestionId: 0x2D1, Value: 0x0"]}

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Record 822

Disable Fast PKG C State Ramp for GT Domain

Firmware Value

This option needs to be configured to reduce acoustic noise during deeper C states.

Firmware help text

This option needs to be configured to reduce acoustic noise during deeper C states. False: Don't disable Fast ramp during deeper C states; True: Disable Fast ramp during deeper C state

Form
Acoustic Noise Settings
Opcode
OneOf
Question ID
0x2d7
VarStore
CpuSetup
VarStore GUID
B08F97FF-E6E8-4193-A997-5E9E9B0ADB32
Offset
0x1fe
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0FALSEStandard defaultManufacturing default
1TRUE

Visibility / conditions

  • {"condition_id": 310, "type": "GrayOutIf", "offset": 350381, "expr": ["EqIdVal QuestionId: 0x2D1, Value: 0x0"]}

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Record 823

Slow Slew Rate for GT Domain

Firmware Value

Set VR GT Slow Slew Rate for Deep Package C State ramp time; Slow slew rate equals to Fast divided by number, the number is 2, 4, 8 to slow down the slew rate to help minimize acoustic noise; divide by 16 is disabled

Form
Acoustic Noise Settings
Opcode
OneOf
Question ID
0x2d8
VarStore
CpuSetup
VarStore GUID
B08F97FF-E6E8-4193-A997-5E9E9B0ADB32
Offset
0x203
Width
1 byte(s)
Range
0 to 2 step 0
ValueLabelMarkers
0Fast/2Standard defaultManufacturing default
1Fast/4
2Fast/8

Visibility / conditions

  • {"condition_id": 310, "type": "GrayOutIf", "offset": 350381, "expr": ["EqIdVal QuestionId: 0x2D1, Value: 0x0"]}

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Record 824

Disable Fast PKG C State Ramp for SA Domain

Firmware Value

This option needs to be configured to reduce acoustic noise during deeper C states.

Firmware help text

This option needs to be configured to reduce acoustic noise during deeper C states. False: Don't disable Fast ramp during deeper C states; True: Disable Fast ramp during deeper C state

Form
Acoustic Noise Settings
Opcode
OneOf
Question ID
0x2d9
VarStore
CpuSetup
VarStore GUID
B08F97FF-E6E8-4193-A997-5E9E9B0ADB32
Offset
0x1ff
Width
1 byte(s)
Range
0 to 1 step 0
ValueLabelMarkers
0FALSEStandard defaultManufacturing default
1TRUE

Visibility / conditions

  • {"condition_id": 310, "type": "GrayOutIf", "offset": 350381, "expr": ["EqIdVal QuestionId: 0x2D1, Value: 0x0"]}
  • {"condition_id": 311, "type": "SuppressIf", "offset": 350653, "expr": ["EqIdVal QuestionId: 0x1288, Value: 0x0"]}

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