Microsoft recently announced a 14-page white paper titled "Windows 7 Power Management" that describes how power management technology in Windows 7 reduces power consumption. If you want to know how Windows 7 saves power, this white paper will give you the answer. If you just want to take a quick and easy look, the following will tell you the main means of saving Windows 7 power.
1. Energy consumption of idle resources
When a computer is started, it will not be in full load operation, so there will be a lot of idle time, so the power consumption in idle time becomes a power management. Important technology. In Windows 7, the power consumption during idle time is effectively improved. When a certain hardware does not work for a certain period of time, it will enter a low power state and achieve power saving. This technology is used in the CPU, hard disk, memory and network parts. For example, a CPU with a full power consumption of 35w consumes almost zero power when idle, and this alone can save a lot of power.
2. Start the service by triggering
Usually the system service will start together when the system starts, and then stay in the background and wait for the call. In Windows 7, some system services are only started when triggered by some events, such as inserting a device or changing the IP. This reduces the number of long-running services in the background process.
3. Enhanced Processor Power Management
Windows 7 integrates the latest power management technology that allows Windows 7 to dynamically adjust CPU performance based on current load conditions and performance requirements.
4. Adaptive display brightness adjustment
Microsoft said that the display will automatically turn off if there is no operation for 10-15 minutes. However, there will be more short-term no-operations in actual use, and in order to save energy, the technology will reduce the brightness of the display. In addition, it can use some sensing devices to adjust the brightness of the display according to the brightness of the surrounding environment.
5. Low Power Audio
Windows 7 will support Intel's low-power HD audio specification, which allows the codec to enter a very low power state. Windows 7 also supports selective suspend technology to turn off devices that are idle, such as USB devices such as microphones and cameras.
6. Timer integration
At present, the processor achieves energy saving by utilizing the gap free time of processing instructions, but most energy-saving technologies require a certain length of idle time to obtain energy-saving effects. This technology increases the idle time of the processor by allowing the Windows kernel to terminate at the same time and concentrate on a plurality of timers that are more dispersed.
In addition, Windows 7 will reduce the frequency of non-critical daemons when the notebook is using a battery.
7. Bluetooth device power consumption improvement
When Windows 7 detects that Bluetooth devices are in low power state, they will be temporarily turned off, that is, "optional suspend".
8. Network device power consumption improvement
The compatibility of the wireless network controller low power mode in Windows 7 has been strengthened, and it is only enabled when the wireless AP device supports the low power mode. Remind everyone that Vista can cause a sudden interruption in wireless network connection because it cannot detect whether it supports low-power mode in advance. Windows 7 will prevent this from happening. It will first detect if the wireless AP supports this mode before entering the low power mode.
9. Optimization of Typical Applications
In addition to the improvements listed above, Microsoft has turned its attention to specific applications, including search, browsing without networking and small games. The following is part of the optimization scheme for DVD playback:
Let the CPU maintain low power mode without affecting playback performance
Improve the power consumption of desktop window manager and GPU by changing the architecture
Intelligence Data caching can reduce the speed of the optical drive
Above is the 9 important improvements in power management of Windows7, which can save more power than the previous system. In addition to these improvements, IT professionals can use power management diagnostics to find problems that can affect power efficiency.