Step 1: Windows Energy Saving Features

Windows has built in features to save energy

Go to the control panel, and click "Power Options." Select a power saving power plan. Then go to "Choose When to turn off the display." My personal preference is to turn off the display after five minutes idle, and sleep after ten minutes.

Step 2: Physically Reducing Power Consumption

Downlclocking your components reduces the speed at which they operate, but will also reduce power consumption and head production. You can downclock your video card with software like ATItool and EVGA precision tool. Contrary to it's name, ATItool also works on nVidia cards.


EVGA precision (for evga cards only)

Step 3: Other

Lower the brightness on your monitor when it is dark out.

Buy an 80+ certified power supply. These guarantee 80 percent efficiency at many load levels.

Here's a simple one: Don't leave your computer on when you're not using it!

There are other green components you can buy such as hard drives.

The new HD 4890 video cards automatically downclock themselves when they idle, and use significantly less power than the 4870 and 4850 do on idle.

You can permanently downlclock your cpu, but i don't know how to do that. You can also lower the core voltage of your cpu, but if you do not lower the multiplier/fsb along with it, it will probably not be very stable.



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    9 Discussions


    2 years ago

    The best energy-saving compute tip is to just make sure it sleeps or hibernates when not in use. One way to do this is to use a program like MollieSoft WinSleep, which lets you define usage limits and a time schedule governing when your computer sleeps. It also shows you when it was awake or asleep over the last week or so.

    80 Plus now has 80 Plus Bronze, Silver, and Gold ratings, which are even more efficient.

    You really shouldn't do this. What you need is a dynamic scaler that changes your cpu clock based on system load. The cpu saves power when its in low c states. Running at the highest clock to get something done quick so it can get back down to low c states can save more power then always running at a lower clock.

    You can also reduce the fan speed, which brings the advantage of reducing noise. Be careful not to lower it too much, especially in summer!!.

    4 replies

    When the electrical components become hot, their resistance increases (hence why people increase their core voltage when they OC), so that tiny amount saved from lowering the fan speed would most likely be taken back when the processor is under load because of this increase in resistance...

    Maybe, but lowering the fan speed would probably increase the resistance of a variable resistor, which would only turn the electricity into heat. Also, only some motherboards support fan speed software like speedfan.

    Using a resistor to slow the fan still will decrease power consumption -- some energy is dissipated as heat, but the fan and resistor together will still lower the total current. (Think of the resistor like putting a kink in a water hose to make less water flow through. A little bit of the water pressure's energy is wasted by converting it to sound as the water makes a hissing noise because of the blockage, but you could be blocking a lot of excess water from going through if you don't need it all at the end of the hose.)

    A decent heat-sink doesn't need a fan under low-load conditions. I can set my BIOS to cut out the system fan under (any temperature I like). Gigabyte board. L

    Of all things, I wouldn't mess with the fans at all. A typical CPU fan will draw approximately 0.2W at it's peak...The increased heat will overrun that easily. Using a monitor's sleep feature will save that after about a second... Drives and the monitor are the biggest power-consumers, I'd suggest focusing on those instead.