Power consumption is no joke. 3 PCs each pulling 220 watts costs about 10 cents an hour. If those computers dont sleep correctly, and if flash gets left running, then they're going to pull that much power 24/7. That is, believe it or not, over $800 a year.
I think any P4/conroe/athlonXX pc that gets used every day should be replaced by a $300 pentium notebook if it is fast enough, which it would be for most users. We're talking about going from 90-180 watts to probably 15/25 watts at the wall. That's about 50 cents a day or $150 a year. lol it pays for itself in two years and is most likely faster too...
My current rig, which is in my sig, I don't know how much it draws yet, but it must draw a bunch.
I used to run two Q9300 @ 3.0 rigs, with GTX460 1GB OC cards, running DC,
and a quad-GPU monster, with four 9600GSOs (and a low-power AMD dual-core CPU).
I moved the quad-GPU cruncher (which takes 400W under load) to a relative's place, so it's not in my apt anymore. I still have one Q9300 @ 3.0, with a HD4850, running Milkyway@Home 24/7, and then my main X6 1045T @ 3.51 rig, with two GTX460 cards, which I did have running BOINC/DC stuff for a while too.
I just got my power bill, and it was ~$130. It's been that high for three months. It was $150 during the winter, when I was heating my apt with the quad-GPU cruncher and my main rig. I even had to leave the windows open part-way in the Winter.
I've stopped running DC on the two GTX460 cards, which should save some power, I haven't run the AC much the last month, and the quad-GPU cruncher is gone. Why is my power bill still so high?
I wonder about the power draw of this X6.
I also have a HTPC with a BE-2400 low-power dual-core and 2GB of DDR2, and a WD Green drive, which stays on 24/7, but is generally at idle. But that hasn't changed over the last year or so.
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So between the HTPC, the Q9300 @ 3.0 quad-core with HD4850 (running DC 24/7), and my main rig (CPU running DC on six threads, GTX460 cards idle), and maybe a little AC during the warm weather, I'm paying $130/mo. I pay $0.15 per Kwh. So that's $1560 for electricity per year. Ouch!