A typical desktop computer uses about 65 to 250 watts
Most laptop computers use about 15-60 watts, far less than desktops.
With most devices you can look at the label to see how much energy they use, but that doesn’t work so well with computers because the label gives the theoretical maximum, not the typical amount used. A computer whose label or power supply says 300 watts might only use about 70 watts when it’s actually running, and only 100 even in peak times with serious number-crunching and all the drives spinning
How much it costs to run your computer
To calculate your costs use this formula:
|x Cost per kilowatt-hour = Total Cost|
For example, let’s say you have a big high-end computer with a gaming-level graphics card and an old CRT monitor, and you leave them on 24/7. That’s about 200 watts x 24 hours x 365 days/yr = 1,752,000 watt-hours, or 1752 kilowatt-hours. If you’re paying $0.36 per kWh, you’re paying $631 a year to run your computer. (In California, PG&E’s highest tier is $0.33/kWh, and the average in Hawaii is $0.36/kWh. source)
Let’s try a different example: You have a computer that’s less of an energy hog, like in iMac G5 20″, which uses about 105 watts, and you’re smart enough to turn it off or sleep it when you’re not using it. You use it for two hours a day, five days a week. That’s 105 watts x 10 hours/week x 52 weeks/year = 54,600 watt-hours, or 54.6 kWh. If you’re paying 10¢ per kilowatt-hour, then you’re paying about $5.50 a year to run your computer
Factors that affect energy use
More Energy Less Energy Ready to be used Sleep / Standby Desktop Laptop Faster processor Slower processor Older processor (Pentium, G3/G4/G5) Newer processor (Core Duo) PC Mac Heavy use
(all drives spinning, processor-intensive task)
(e.g., email, word processing)
On the Internet Offline
Yes, it doesn’t make sense that the GX620 is listed as using more power when it’s off than when it’s sleeping, but I’m just reprinting the numbers from Dell’s specs.
Reduce your electricity bill, hardware and support costs
Thin Desktop‘s ability to turn 1 computer into 20 saves you money by greatly reducing hardware and support costs. Multiplying your computers with Userful will significantly reduce your electricity bill, with even higher savings in an air-conditioned building.