Is it better to put your computer to sleep at night, like a little electronic baby, or shut it down to save energy like a good global eco-citizen?
The minuscule amount of energy, if any, saved with a nightly shutdown won’t reduce anyone’s carbon footprint much but could shorten your computer’s life. The daily on-off stress isn’t good for your computer’s heart. It’ll only lead to an early trip to the landfill or recycling center.
“A power cycle, which is turning a computer off fully and then turning it back on, should be relegated to a maintenance activity on approximately a weekly basis,” says Damian Giannunzio, director of Iolo Labs of Los Angeles, which studies PC performance and stability.
Giannunzio, whose research contributes to the development of Iolo Technologies’ repair and optimization software for Windows PCs, says he runs his own computer in balanced power mode. This default Windows setting provides peak performance only on demand.
“Having done a significant body of testing with the different power modes,” he says, “I’m actually quite pleased with balanced. It essentially permits the (processor) cycling to match up with your activity on the system. … It doesn’t throttle your productivity like a low mode would.”
Even gamers should question whether Windows’ high-performance power mode, with maxed-out screen brightness and processor constantly in high gear, is worth higher operating temperatures, increased power consumption, more noise and shorter life span.
“High performance, in my mind, is terrible,” Giannunzio says. “It is absolutely not worth essentially removing any sort of limitation on (the processor’s) frequency. It’s no longer intelligent or adaptive.
“When you go into high-performance mode, you’re letting it run at peak speeds all the time. That is death to a system. At low mode, you do end up seeing a penalty, which is activity and speeds of the system.”
So run your PC in balanced power mode and put it to bed each night in either standby or hibernate. Standby uses little power and awakes faster, while hibernate uses no power but revives slowly. (Apple computers have adjustable energy-saver sleep and idle modes.)
A fully charged notebook computer connected to a power outlet consumes an average of 29.48 watts, according to the Lawrence Berkeley National Laboratory’s tests for the Department of Energy. In sleep mode, it averages 15.77 watts. Turned off, it still consumes 8.9 watts. (The numbers for the laptop I used to write this column: 17.1 watts on and only 0.8 watts in both standby and when turned off.)
Those 8.9 watts are classified as vampire, or phantom, power – energy used by devices ostensibly shut down. Your TV and cable box are energy hogs. So are printers, gaming consoles and coffee makers.
Find out how much energy is being wasted in your home with these devices.
• Kill A Watt ($29.95, P3 International, p3international.com): Plug this into an electrical outlet, and then plug any device into the Kill A Watt. Energy consumption in watts or kilowatt-hour appears on the LCD screen. You can also check how much it costs to run the device by the day or year.
• Watts Up? ($95.95, wattsupmeters.com): Easier to access with compact console and power cord. Aside from the Kill A Watt basics, this meter also knows when your equipment has exceeded a designated power threshold and calculates costs. (This column has consumed 1.2 cents in laptop-use electricity so far.)
Smart power strips that reduce energy:
• Belkin Conserve Smart AV ($29.99, belkin.com): A single master outlet controls five other outlets on this eight-outlet surge protector. Let’s designate the HDTV as the master, with a Blu-ray player, audio-video receiver and other components in line. Turning the TV off also turns off, and cuts electricity to the others, eliminating standby power. When the TV turns on, the rest turn on.
• Kill A Watt PS-10 ($99.95, p3international.com): A 10-outlet surge protector with built-in Kill A Watt meter that monitors electrical use of all devices plugged into the strip.
Here’s the new nighttime ritual: Put your computer to sleep, turn off the monitor and use a smart power strip to kill electricity to vampire power users. Then you can put yourself into sleep mode.
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