I don't know what the exact numbers would be, and they would be different for every system, but there is a trade-off between booting x times per day, and just leaving the machine on. i.e. one boot sequence equates to x minutes/hours of the computer idling.
CRT Monitors can be a relatively large power drag, while they are on. So it is very worthwhile to use the power save features on them.
A last comment about electricity costs in Calgary. Since de-regulation / unbundling of those services, the bills have become much more complex, but they are much more transparent about component costs (transportation system costs vs. energy charges, etc.). If you look at your power bill, you'll find that a significant portion of the total bill are fixed charges. For example, they charge separately for the lines to your house and the amount of electricity you use. So if you cut 20% of your total power consumption, it does not mean that you will save 20% of your electrical bill. Makes some sense, too, since the wiring to your house is the same regardless of consumption and needs to be paid for, too.
...Niels
Kevin Anderson wrote:
Here's my take on it...
It costs very little.
My older machines have generally got smaller than a 200 watt power supply in them. That power supply would be capable of running them along with several CDRoms, and HDDS all spinning at the same time. My IPcop box has 1 hdd, and isn't overly used except for caching (which COULD be turned off). I would be quite suprised if that system was using more than 50 watts, which is a pretty dim light bulb.
My server is a Celeron ~800, with 2 hdds. But it's newer, and more inteligent power wise. If you want to see more efficiency, I'd consolidate your servers. Depending on how you use them, this may be an opportunity to use the User Mode Linux stuff. ( http://www.gentoo.org/doc/en/uml.xml ) Most people have WAY too much power in their servers for what they actually need. I run us (at work) on a P3 xeon 733 with 2 Gigs of RAM, and it rarely works at all. I'm sure that if I shut down Jabber, I'd have a utilization of less than .01% Jabber seems to be a pig. At home, I'd be surprised if the server was using 125 watts. Obviously, that will go up when I compile or something, but averaged over time, I can't see the two of them using 200 watts.
Does that add up to something? Probably. But not much. Maybe $10 a month, maybe? I swapped out our 12 most used light bulbs for compact florescent ones, and saw a $20/month savings. There are easier and better places to save money, generally. Windows and doors rank high on that list. I found that florescent bulbs to rank VERY high on that list, and frankly, I really like the fact that they don't really seem to be florescent. They last forever, and they're really easy to change to. Best of all, they don't flicker like the ones most larger buildings have in their ceilings. That would be a deal breaker for me, personally.
Kev.
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