Windows 7 Guide- Power Management
In present, companies focus on power management as a way to decrease costs and reduce their carbon emissions. One method to reduce the cost of running client computers is to reduce the power that is consumed.
Reduced Power Consumption:
Microsoft developed Windows 7 with a strong focus on reducing the overall power consumption by investing in key areas of the platform including performance optimizations, idle resource utilization, device power management, and key end-user scenarios.
Energy efficiency requires investments across the whole platform, not only in the core hardware or in the operating system. While Windows 7 can have a significant impact on platform energy efficiency, attached devices, and non-Microsoft and end-user programs,
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The complexity and quantity of platform extensions require a larger approach to energy efficiency beyond focusing on a single component in the platform. In addition to core investments in Windows 7,
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Enhanced Processor Power Management
Windows 7 offers device driver support for the latest processor power management (PPM) technologies. Performance and power consumption modes for the processor are called performance states. The PPM technologies allow the Windows to
choose the right processor performance state depending on the load, and then rate the performance of the system accordingly.
Windows 7 features significant changes to the accounting of processor activity, which enables much greater accuracy in determining which performance state is appropriate for the processor based on current system activity. These improvements enable greater energy efficiency across a broad range of workloads. In-box support of these technologies enables power-saving benefits immediately after installation.
Device Power Management
Windows 7 offers improved device power management. It enables low-power modes across several technologies,
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Low-Power Audio
Windows 7 supports the new Intel HD Audio low power specification. This specification introduces a fourth power state D3Cold which is defined as the lowest unresponsive power state that a codec can go into yet still wake up.
The Windows 7 HD Audio Class Driver takes advantage of this power state to further conserve power when an audio device is not in use. Windows 7 can also support USB audio class selective suspends, which reduces the complexity of platform integration for array microphone and USB Web camera solutions. Support for selective suspend in audio-class devices helps make USB-based solutions possible without significantly affecting battery life.
Bluetooth Power Improvements
Windows 7 increases battery life by enabling state of selective suspend when it detects that a Bluetooth device has entered a lower power state. Normally, when the client system is connected to a Bluetooth device, the radio and the USB bus are always active, whereas the device may be entering a lower-power state if it does not require to use the Bluetooth connection. With Windows 7, if the device enters its low-power mode, Windows 7 enables a state of selective suspend on the computer allowing both side of the connection to save power.
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