9 Ways How Windows 7 Will Save Battery Life
Microsoft recently released a new 14-page whitepaper entitled “Windows 7 Power Management” to outline the power management technologies in Windows 7 that reduce power consumption. For those curious as to how exactly Windows 7 will use less power, this is your answer. For those who just want the quick scoop, here are 8 different ways how Windows 7 mainly save battery life:
1) Idle Resource Utilization
This is one of the most important power management technologies because idle time is a significant portion of the time a computer is turned on. Idle efficiency in Windows 7 is improved by reducing resource utilization and enabling hardware to go into lower power states during long periods of inactivity. This includes the processor, disk, memory, and network activity on the computer. To demonstrate just how much power can be saved, CPUs consume nearly 0 watts when idle, but up to 35 watts at full power.
2) Trigger Start Services
Services were usually started automatically right after startup and would run in the background waiting for an event to occur. In Windows 7, certain services are only started when triggered by an event such as device insertion or an IP change. This makes it unnecessary to have services starting all the time and reduces the amount of background processes.
3) Enhanced Processor Power Management
Windows 7 will include device driver support for the latest PPM technologies. PPM allows Windows 7 to choose the appropriate processor performance state depending on the load and scale performance accordingly.
4) Adaptive Display Brightness
Microsoft says that the average display is set to turn off after 10-15 minutes of inactivity. Often times however, there are shorter periods of inactivity in between. To save additional power, ADB defines will allow dimming the display. ADB can also utilize hardware sensor technology to adjust display brightness accordingly to ambient light.
5) Low-Power Audio
Windows 7 will support the latest Intel HD Audio low-power specification, which introduces a new power state known as D3Cold. This is the lowest unresponsive power state that a codec can go into. It can also further conserve power when an audio device is not in use. Windows 7 also supports selective suspend technology that extends to USB audio-class devices such as microphones and web-cams.
6) Timer Coalescing
Modern processors reduce power consumption by taking advantage of idle time between executing instructions, but many PPM technologies require a minimum amount of idle time before obtaining any net-power savings. Timer Coalescing increases the average idle period by letting the Windows kernel combine periodic software activity.
Additionally, Windows 7 will defer non-critical background activity when the user is on a battery-powered setup (netbook or notebook).
7) Bluetooth Power Improvements
Windows 7 will enable a state of “selective suspend” when it detects that a Bluetooth device has entered a low-power state.
8. Networking Power Improvements
Network adapters enter a lower-power state (known as D3) if supported by the adapter and driver whenever a network cable is removed. Low-power mode capability for wireless network controllers has been improved. Low-power mode is only entered if the access point supports it. Vista was unable to detect if the mode was supported and would cause computers to suddenly disconnect from the wireless network. Windows 7 will detect compatibility before entering the low-power mode.
9) Optimizations to key user scenarios
In addition to the improvements listed above, Microsoft also looked at specific key scenarios they could optimize including search, Internet browsing, and casual gaming. Here is an example of some of the optimizations made to a DVD Playback scenario:
- The ability for the CPU to stay in lower performance states without affecting playback performance
- Improvement of the Desktop Windows Manager (DWM) and Graphics Processing Unit (GPU) utilization through architectural changes
- Smart data caching that allow optical disk drive spin-down
These are the nine key ways Windows 7′s power management will improve, saving a lot more battery life than its predecessors on portable computing. In addition to these great improvements are power-management diagnostics to help IT pros determine problems that may be affecting power efficiency. For full technical info and additional resources, click here to check out Microsoft’s site to download the whitepaper.
Related posts:
Tags: windows 7, windows 7 battery life, windows 7 power, windows 7 power management
To discuss this topic, head on over to our forums!
18 Responses to “9 Ways How Windows 7 Will Save Battery Life”
Leave a Reply
To discuss this topic, head on over to our forums!
Loading ...
So are these things all built in to the OS, or are there settings we need to change?
Some of them can be tweaked in the power settings as shown in the pic, some are just features that are part of the OS
I have a notebook with SoundMAX Integrated HD Audio. After some time with no sound playback audio device enters power state D3. Going back to D0 (full power) takes up to 10 seconds. In real life it means, that when I want to play some sound it can take up to 10 seconds before it starts playing. Is there any way to disable this power saving for audio device? It’s most probably caused by the new Low Power Audio feature of Windows 7, because I didn’t have any problem with it in Vista. I’m using built in MS driver.
Might just be the driver…keep in mind that MS issued drivers for Windows 7 should also be considered beta software so it may not be perfected yet. My laptop uses the Sigmatel HD Audio 64-bit driver and hasn’t had any problems. However, this driver is not issued by Microsoft but rather this is a Vista driver released by Dell. Try the SoundMAX driver issued by your laptop manufacturer as well.
Sounds nice, I wonder what changes they made to the GPU usage, and how they effect games?
side note:
this sentence from the end of the introduction paragraph
“here are 8 different ways how Windows 7 mainly save battery life:”
Is this supposed to say 9 different ways?
I could add something that could potentially save some power although I don’t know if this is significant or not. Windows 7 copies/moves files a lot faster than Vista and this is clearly noticeable for me. So shorter the span of time the hard drive has to read or write, the less time the hard drive will be spinning saving you some battery power. Windows 7 is also SSD optimized so for those compelled to make a switch, you’ll save some battery life there as well.
[...] Kapcsolódó cikkek: antionline.com, saveabattery, windows7center.com [...]
[...] The article Via http://windows7center.com/news/9-ways-how-windows-7-will-save-battery-life/ [...]
Yeah but doesn’t all this extra power saving algorithms require extra thinking for the CPU to crunch?
Also, I find that many of the settings, except for the most basic, such as turning off the screen and the computer after __ minutes work with legacy machines.
In Vista my laptop’s estimated maximum battery life on standby was around 10 hours. Now in Windows 7 using all equivalent power-saving options it’s hardly reaching 6 hours.
The question being: is Windows 7′s estimated battery life calculated more “long term” wise vs. Vista’s “based on the current activity”? As of now it “appears” that Windows 7 is far behind Vista…
Correction: by “on standby” display, hard drive etc turned on but no open programs or any other activity.
Sweet Details I enjoy some of the articles that have been written, and especially the comments posted! I am going to come back!
[...] is ironic that Microsoft’s claim that Windows 7 will improve battery life is being countered by some users threatening class action lawsuits due to W7 ruining laptop [...]
[...] So this will make a difference. This site explains in great deal over the Battery mgmt: 9 Ways How Windows 7 Will Save Battery Life | Windows 7 Center [...]
Thats great but it will not give much different……
nice post…..
>CPU consumes 0 Watts when idle.
lol
Skate Longboards
cool post =)