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Author Topic: Computers vs Electric Bill?  (Read 1140 times)
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Scott
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« on: August 09, 2006, 02:54:21 PM »

How much power do newer computers suck up these days?  

For example, is a computer witha 650W power supply, and say two 7900GTs in SLI mode make a noticeable dent on the power bill these days?
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Kobra
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« Reply #1 on: August 10, 2006, 11:56:23 PM »

Short answer: They consume a ton of power.

Long Answer:

Figure $20-$25 or more a month per PC for a modern system. If you have power hungry CPU/GPU's, you can add a good $5-10 a month to that.

Also don't forget, PCs, Monitors and everything else draw trickle power even when they are turned off, this really adds up.  I keep my boxes on a master switch that I "Kill" everynight before I hit the sack.  This dropped $10 a month off my electric bill.

I used to have 5 boxes on a lan gaming cluster here, but we recently cut back to 3 (one for me, the other two for the wife and kids) because of the high power bills and it is $$$ keeping 5 boxes up to date reasonably well.
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Scott
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« Reply #2 on: August 11, 2006, 01:20:12 AM »

Quote
Figure $20-$25 or more a month per PC for a modern system. If you have power hungry CPU/GPU's, you can add a good $5-10 a month to that.

Ouch.  How often did you leave yours on for that?

Quote
Also don't forget, PCs, Monitors and everything else draw trickle power even when they are turned off, this really adds up. I keep my boxes on a master switch that I "Kill" everynight before I hit the sack. This dropped $10 a month off my electric bill.

I'm assuming for all 5?

That's crazy though, I didn't think the drain was that bad.
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Kobra
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« Reply #3 on: August 11, 2006, 03:37:49 AM »

All 5 weren't left on, in fact 2 of them were seldom on.  Mine was on almost all day everyday, my two sons varied.  Mine was obviously the biggest hit.
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Turtle
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« Reply #4 on: August 15, 2006, 09:05:55 AM »

There is some debate about this, but anyone know if a computer/power supply is constantly pulling its wattage or just about as much as it needs?
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Kobra
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« Reply #5 on: August 15, 2006, 03:25:31 PM »

Quote from: Turtle on August 15, 2006, 09:05:55 AM

There is some debate about this, but anyone know if a computer/power supply is constantly pulling its wattage or just about as much as it needs?

I wish I knew the answer, my friends and I debate this. I think it draws a constant wattage from the P/S, however a buddy claims otherwise, sayin g this is the reason some chips and components use their power draw as a selling point.

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« Reply #6 on: August 15, 2006, 03:50:32 PM »

Quote from: Turtle on August 15, 2006, 09:05:55 AM

There is some debate about this, but anyone know if a computer/power supply is constantly pulling its wattage or just about as much as it needs?
Hm... good question, and one I tried to research to no avail yesterday.

I was under the impression that a standard PSU constantly pulled its full listed wattage out, but I have no idea how I got that impression.

EDIT:  I just found the answer -- PSUs only pull what they need based on the resistance of attached components.

Quote
A switcher power supply draws only the power it needs from the AC line.

Source:
http://computer.howstuffworks.com/power-supply1.htm

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dbt1949
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« Reply #7 on: August 16, 2006, 02:23:36 AM »

I think my pc's have 400-450 watt power supplies. That's roughly 4 100 watt light bulbs when the pc is really going. That of course doesn't count the monitor and all the periphials.
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Sarkus
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« Reply #8 on: August 17, 2006, 07:26:56 AM »

Quote from: Kobra on August 10, 2006, 11:56:23 PM

Figure $20-$25 or more a month per PC for a modern system. If you have power hungry CPU/GPU's, you can add a good $5-10 a month to that.

I find that hard to believe since my electric bill averages about that in the summer unless your electric rates are much higher.  Things like washing machines, refrigerators, and ovens take up a lot more juice.  dbt1949's reasoning makes more sense.  Figure it's the equivalent of 6 or 8 100 watt bulbs for as long as you have it on each day.  The power off trickle is really too minor to even worry about.

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Kobra
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« Reply #9 on: August 17, 2006, 03:29:25 PM »

$20-25 if they are left on 24/7.  Casual use, subtract as necessary.

Trickle charges are underestimated, a study in teh UK found 8-10% of all energy use is from trickle charges and they are moving to outlaw them on electronic devices sold there.  http://technology.timesonline.co.uk/article/0,,19509-2266159,00.html

Like I said, I eliminated most trickle charges in my house, and dropped $10 off my monthly bill.  But I did have to buy smart power strips for the non-PC stuff so those standby charges were killed as well.
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stiffler
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« Reply #10 on: August 17, 2006, 11:29:10 PM »

Quote from: Kobra on August 17, 2006, 03:29:25 PM

Trickle charges are underestimated, a study in teh UK found 8-10% of all energy use is from trickle charges and they are moving to outlaw them on electronic devices sold there.  http://technology.timesonline.co.uk/article/0,,19509-2266159,00.html

Interesting.  I really don't need my PS2 staring at me with the red standby light.
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