ASUS UEFI BIOS

Ai Tweaker menu

The Ai Tweaker menu items allow you to configure overclocking-related items.

Remarks

• Be cautious when changing the settings of the Ai Tweaker menu items. Incorrect field values can cause the system to malfunction
• The configuration options for this section vary depending on the CPU and DIMM model you installed on the motherboard.

CPU Core Ratio

This item allows you to set the CPU core ratio limit per core or synchronize automatically to all cores. Configuration options: [Auto] [Sync All Cores] [Per Core]

Remarks

When the CPU Core Ratio is set to [Sync All Cores] or [Per Core], the following items appear.

1-Core Ratio Limit [Auto]

Select [Auto] to apply the CPU default Turbo Ratio setting or manually assign a 1-Core Limit value that must be higher than or equal to the 2-Core Ratio Limit.

2-Core Ratio Limit [Auto]

Select [Auto] to apply the CPU default Turbo Ratio setting or manually assign a 2-Core Limit value that must be higher than or equal to the 3-Core Ratio Limit.

Remarks

If you assign a value for 2-Core Ratio Limit, do not set the 1-Core Ratio Limit to [Auto]. 11 BIOS Setup

AVX Instruction Core Ratio Negative Offset

Enter the numerical value that will be subtracted from your core ratio to get the ratio at which the AVX applications run. This item only displays when you install Intel® 7th Generation K series processors.

DRAM Odd Ratio Mode [Enabled]

Allows you to enable or disable the DRAM Odd Ratio Mode, which provides better granularity. Configuration options: [Disabled] [Enabled]

DRAM Frequency [Auto]

This item allows you to set the memory operating frequency. The configurable options vary with the BCLK (base clock) frequency setting. Select the auto mode to apply the optimized setting. Configuration options: [Auto] [DDR4-800MHz] - [DDR4-4266MHz]

Remarks

Selecting a very high memory frequency may cause the system to become unstable! If this happens, revert to the default setting.

EPU and Performance Mode [Auto]

EPU and Performance Mode lets you configure the power usage to boost or enhance system performance. [Auto]Automatically adjusts the power usage based on the system load. [Max Power-Saving Mode]Enables all power-saving settings for maximum energy- saving condition. [EPU Mode]Lowers the CPU core/cache voltage for the best energy- saving condition. [Performance Mode]Disables all power-saving settings to achieve a high system performance.

CPU SVID Support [Auto]

Disabling SVID Support stops the processor from communicating with the external voltage regulator. Configuration options: [Auto] [Disabled] [Enabled]

DRAM Timing Control

The subitems in this menu allow you to set the DRAM timing control features. Use the + and - keys to adjust the value. To restore the default setting, type [auto] using the keyboard and press the Enter key.

Remarks

Changing the values in this menu may cause the system to become unstable! If this happens, revert to the default settings.

DIGI+ VRM

CPU Load-Line Calibration [Auto]

Load-line is defined by Intel VRM specification and affects the CPU power voltage. The CPU working voltage will decrease proportionally depending on the CPU loading. Higher levels of the load-line calibration can get a higher voltage and a better overclocking performance but increases the CPU and VRM thermal. Configuration options: [Auto] [Level 1] [Level 2] ~ [Level 6] [Level 7]

Remarks

The boosted performance may vary depending on the CPU specification. Do not remove the thermal module.

CPU Current Capability [Auto]

Allows you to configure the total power range, and extends the overclocking frequency range simultaneously. Configuration options: [Auto] [100%] [110%] [120%] [130%] [140%]

Remarks

Choose a higher value when overclocking, or under a high CPU loading for extra power support.

CPU VRM Switching Frequency [Auto]

This item affects the VRM transient response speed and the component thermal production. Select [Manual] to configure a higher frequency for a quicker transient response speed. Configuration options: [Auto] [Manual]

Remarks

• DO NOT remove the thermal module. The thermal conditions should be monitored.
• The following item appears only when you set the CPU VRM Switching Frequency to [Manual].

  Fixed CPU VRM Switching Frequency (KHz) [250]

  This item allows you to set a higher frequency for a quicker transient response speed. Use the + and - keys to adjust the value. The values range from 250KHz to 300KHz with a 50KHz interval.

VRM Spread Spectrum [Disabled]

This item allows you to reduce the magnitude of peak noise from the VRM.Disable this setting when overclocking. Configuration options: [Disabled] [Enabled]

CPU Power Duty Control [T.Probe]

DIGI + VRM Duty control adjusts the current and thermal conditions of every component’s phase. [T. Probe] Select to maintain the VRM thermal balance.[Extreme] Select to maintain the current VRM balance.

CPU Power Phase Control [Auto]

This item allows you to set the power phase control of the CPU. Configuration options: [Auto] [Standard] [Optimized] [Extreme]

CPU Graphics Load-Line Calibration [Auto]

 Load-line is defined by Intel VRM specification and affects the GT power voltage. The GT working voltage will decrease proportionally depending on the GT loading. Higher levels of the load-line calibration can get a higher voltage and a better overclocking performance but increases the GT and VRM thermal. Select from level 1 to 7 to adjust the GT power voltage from 0% to 100%. Configuration options: [Auto] [Level 1] [Level 2] [Level 3] [Level 4] [Level 5] [Level 6] [Level 7]

Remarks

The boosted performance may vary depending on the GT specification. Do not remove the thermal module.

CPU Graphics Current Capability [Auto]

 Allows you to configure the total power range, and extends the overclocking frequency range simultaneously. Configuration options: [Auto] [100%] [110%] [120%] [130%] [140%]

Remarks

Choose a higher value when overclocking, or under a high GT loading for extra power support.

CPU Graphics VRM Switching Frequency [Auto]

 This item affects the CPU Graphics transient response speed and the component thermal production. Select [Manual] to configure a higher frequency for a quicker transient response speed. Configuration options: [Auto] [Manual]

Remarks

• DO NOT remove the thermal module. The thermal conditions should be monitored.
• The following item appears only when you set the GT VRM Switching Frequency to [Manual].

  Fixed CPU Graphics Switching Frequency (KHz) [300]

   This item allows you to set a higher frequency for a quicker transient response speed. Use the + and - keys to adjust the value. The values range from 250KHz to 500KHz with a 50KHz interval.

Internal CPU Power Management

 The subitems in this menu allow you to set the CPU ratio and their features.

Intel(R) SpeedStep(tm) [Enabled]

 This item allows the operating system to dynamically adjust the processor voltage and cores frequency, resulting to a decreased average power consumption and decreased average heat production. Configuration options: [Disabled] [Enabled] 

Turbo Mode Parameters

 

Long Duration Package Power Limit [Auto]

 Allows you to limit the Turbo Ratio’s time duration that exceeds the TDP (Thermal Design Power) for maximum performance. Use the + or - keys to adjust the value. The values range from 1 W to 4096 W.

Package Power Time Window [Auto]

 Also known as Power Limit 1, this item allows you to maintain the time window for Turbo Ratio over TDP (Thermal Design Power). Use the + or - keys to adjust the value. The values range from 1 to 127 in seconds.

Short Duration Package Power Limit [Auto]

 Also known as Power Limit 2, this item allows you to provide rapid protection when the package power exceeds the Power Limit 1. Use the + or - keys to adjust the value. The values range from 1 W to 4095 W.

IA AC Load Line [Auto]

 This item allows you to set the AC loadline defined in 1/100 mOhms. Use the + and - keys to adjust the value. Configuration options: [Auto] [0.01] - [62.49] I

A DC Load Line [Auto]

 This item allows you to set the DC loadline defined in 1/100 mOhms. Use the + and - keys to adjust the value. Configuration options: [Auto] [0.01] - [62.49]

CPU Core/Cache Current Limit Max. [Auto]

 Allows you to set a higher current limit to prevent a frequency or power throttling when overclocking. Use the + or - keys to adjust the value. The values range from 0.00A to 255.50A with a 0.25A interval.

CPU Graphics Current Limit [Auto]

 Allows you to set a higher current limit to prevent a frequency or power throttling when overclocking. Use the + or - keys to adjust the value. The values range from 0.00A to 255.50A with a 0.25A interval.

Min. CPU Cache Ratio [Auto]

 This item allows you to set the minimum possible CPU cache ratio. Use the + and - keys to adjust the value. Configuration options: [Auto] [8] - [83]

Max. CPU Cache Ratio [Auto]

 This item allows you to set the maximum possible CPU cache ratio. Use the + and - keys to adjust the value. Configuration options: [Auto] [8] - [83]

Max. CPU Graphics Ratio [Auto]

 This item allows you to set the maximum possible CPU graphics ratio. Use the + and - keys to adjust the value. Configuration options: [Auto] [8] - [83]

CPU Core/Cache Voltage [Auto]

 This item allows you to configure the amount of voltage fed to the CPU cores. Increase the voltage when setting a high Core Frequency value. Configuration options: [Auto] [Manual Mode] [Offset Mode]

Remarks

The following item appears only when you set the CPU Core/Cache Voltage to [Offset Mode].

Offset Mode Sign [+]

[+]To offset the voltage by a positive value. [–] To offset the voltage by a negative value.

CPU Graphics Voltage Offset [Auto]

 This item allows you to configure the CPU Graphics Voltage Offset. Use the + or - keys to adjust the value. The values range from 0.001V to 0.999V with a 0.001V interval.

CPU VCCIO Voltage [Auto]

 This item allows you to set the voltage for the CPU VCCIO. Use the + and - keys to adjust the value. The values range from 0.900V to 1.585V with a 0.005V interval.

CPU System Agent Voltage [Auto]

 This item allows you to set the voltage for the VCCSA. Use the + and - keys to adjust the value. The values range from 0.700V to 1.685V with a 0.005V interval.

CPU Graphics Voltage Mode [Auto]

 This item allows you to configure the mode of voltage fed to the CPU Graphics Voltage. Manual mode allows user-defined values. Offset mode modifies values by SVID. Configuration options: [Auto] [Manual Mode] [Offset Mode]

Remarks

The following item appears only when you set the CPU Graphics Voltage Mode to [Manual Mode].

CPU Graphics Voltage Override [Auto]

 This item allows you to configure the CPU Graphics Voltage Override. Use the + or - keys to adjust the value. The values range from 0.600V to 1.700V with a 0.005V interval.

Remarks

 The following item appears only when you set the CPU Graphics Voltage Mode to [Offset Mode].

Offset Mode Sign [+]

[+]To offset the voltage by a positive value. [–]To offset the voltage by a negative value. .

CPU Graphics Voltage Offset [Auto]

 This item allows you to configure the CPU Graphics Voltage Offset. Use the + or - keys to adjust the value. The values range from 0.001V to 0.999V with a 0.001V interval.

PCH Core Voltage [Auto]

 This item allows you to set the PCH core voltage. Use the + and - keys to adjust the value. The values range from 0.800V to 1.635V with a 0.005V interval.

Internal PLL Voltage [Auto]

 Allows you to configure the offset for the Core PLL VCC Trim.

DRAM REF Voltage Control [Auto]

 The subitems in this menu allows you to set the DRAM reference voltage on the control lines from the memory bus. You can use the + or - keys to adjust the value. 1.6 Advanced menu

Sources and References

• https://dlcdnets.asus.com/pub/ASUS/mb/LGA1151/STRIX_B250F_GAMING/E12497_STRIX_B250F-GAMING_BIOS_UM_web_only_20170706.pdf
• https://dlcdnets.asus.com/pub/ASUS/mb/LGA1151/ROG_STRIX_Z390-I_GAMING/E14477_ROG_STRIX_Z390-I_GAMING_UM_WEB.pdf