IMPORTANT: Configuration settings described on this page will be applied directly to your CPU hardware registers, and most of them will be reset back to default values upon restart or dep sleep. Modifying this settings can potentially void your CPU warranty. Please proceed with care !
All the settings in this section are CPU dependant and will be enabled/disabled based on your CPU model. Another factor that can affect the availability of a particular setting is the fact that it’s not locked by your system BIOS.
If supported by your CPU this setting will enable (if checked) or disable (if unchecked) Turbo Boost. If the power conservation is a priority, unchecking this check box will ensure that your CPU will never attempt to enter frequencies in turbo range. NOTE: this setting can olso be controlled by software on the main screen with Turbo Boost index. Setting this index to 0 will disable the Turbo Boost.
In short Enhanced SpeedStep allows the processor to meet the instantaneous performance needs of the operation being performed, while minimizing power consumption and heat generation.
Enhanced Intel SpeedStep® Technology is an advanced means of enabling CPU high performance while also meeting the power-conservation needs of specific systems. Separation of voltage and frequency changes
By stepping voltage up and down in small increments, the processor is able to reduce periods of system unavailability that occur during frequency change. The system is then able to transition between voltage and frequency states more often, improving balance between power and performance.
Clock partitioning and recovery
The bus clock continues running during state transition, even when the core clock and phase-locked loop are stopped, which allows logic to remain active. The core clock is also able to restart far more quickly under Enhanced Intel SpeedStep Technology than under previous architectures.
Also known as enhanced halt state C1E is also a power saving feature and when enabled will allow your CPU to switch to the Minimum Enhanced Intel SpeedStep Technology operating point, when all execution cores enter MWAIT (C1). In some cases disabling this feature can improve CPU latency.
Hardware Duty Cycling (HDC)
Hardware Duty Cycling (HDC), enables the processor to automatically force its components inside the CPU physical package into idle state. For example, the processor may selectively force one or multiple cores into an idle state depending on the internal CPU package state, as well as lower effective CPU frequency. HDC is a power saving feature during low system load.
Clock modulation is a feature that enables implementation of power management policies that will reduce power consumption. This feature is an addition to power management implemented by thermal monitoring sensors. If set to non 0 value, it will internally reduce the power and speed of your CPU.
Performance / Energy policy
Another power management feature that gives the ability to choose a preference between maximum performance and energy/power conservation.
Turbo power limits
This setting gives the ability to define power limitation for the package. Power limitation is defined in terms of average power usage over a time window specified. Two power limits can be specified, corresponding to time windows of different sizes. Clamping control for each power limit would permit the processor cores to go below the requested state to meet the power limits. And finally, the lock mechanism gives the ability to enforce power limit settings. Once the lock check box is checked, the power limit settings are static and un-modifiable until next reset (restart/deep sleep ).
Turbo power limit form controls
1 - Enable package power limit
2 - If checked, allows going below requested P/T state setting during the time window specified in #4
3 - Sets the average power usage limit of the CPU package corresponding to time window
4 - Sets the time window for power limit
This setting specifies Maximum Turbo limit ratios (multiplier settings), depending on number of CPU cores active.
Hardware controled performance
Hardware controled performance is an implementation of the ACPI-defined Collaborative Processor Performance Control (CPPC).
When this setting is enabled, the processor autonomously selects performance states as deemed appropriate for the applied workload and with consideration of constraining hints that you can set using slider controls. These hints include minimum and maximum performance limits, preference towards energy efficiency or maximum performance. You can manually (using slider controls) override HWP's autonomous selection of performance state with a specific desired performance target.
When Hardware controlled performance is enabled the processor will disregard legacy performance settings. This feature can only be enabled once (before the reset), and will be reset back to default upon system restart or deep sleep. Unchecking the check-box for the second time won’t have any effect.
Minimum allowed performance: sets the value for lowest possible performance that CPU can consider
Maximum allowed performance: sets the value for highest possible performance that CPU can consider
Desired performance: sets the value for specific performance request preferred by the user. when set to 0 hardware will authomatically determine performance target.
Energy performance preference: sets the value form 0 (performance preference) to 255 (energy efficiency preference) to indicate user preference for performance. This setting is not available on all CPU models.
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