Don't be fooled. The 200W PC power supply rating is just like your consumer
unit being rated at 100A. It doesn't mean it is actually eating it all the
time. Whilst idling, a modern PC uses a tiny fraction of this. Even less if
it turns off the hard disks after a period of inactivity.
Many of the components of a desktop PC are similar to those of a laptop.
That runs for hours off a little battery. OK, the desktop versions are
usually a more power hungry, but not by that much.
Funnily enough, 3am is backup time, which takes about 2 hours!
But the monitor's off then :-)
No, this one isn't the server - the server is a very modest
600MHz machine which probably does consume a mere 100W or so.
The Seagate Barracuda 80Gb drive I have in my PC consumes a whole 13W when
active, and your cpu is spec'd at under 70W. Have you upped your bus speed
to 600Mhz or something, or is your graphics card a real hog ? (Still would
expect it to not be using much power in a quiescent mode, though - why have
graphics work no-one can see...)
It's not hard to meet expenses, they're everywhere.
The graphics card is ~20-30W IIRC.
But at idle the monitor's powered down anyway, so surely if the
comparison is to determine the significance of the monitor's
consumption, then we need to look at consumotion with the PC
running and outputting graphics?
Say it breaks down like this:
All other cards: 5W
2x hard drives: 30W
Losses in PSU: 30W
(there's a very good reason it has it's own fan!)
2x case fans, cpu fan: 10W
This is possibly peak requirements?
The case fans must be pretty hefty to be sucking that much power...
I have an 80mm one in fromt of me, it's only 0.14A (1.68w)
The most reliable way to see would be to actually measure it!
There is no difference between a CPU rushing around in a tght loop and
exrecising a full blown compile.
The only thing that opoerartion affects is sometimes disc stepper motors
under high disc access. Otherwise a PC is a constant load device, no
matter what it is doing.
Unless its switched off.
There is some difference, as a tight loop won't lead to many state changes.
However, only very old operating systems run the CPU in the tight loop.
Almost all operating systems will put the CPU into idle if there are no
threads demanding execution, giving even greater power consumption drops.
This hasn't been true for about 10 years.
Well, you mena stepper motors don;t draw current these days?:-)
As far as CPU idling goes, only laptops seem to bother to do anything
when the computer is not actually being tapped upon.
After all, the screen stll need srefreshing, the RAM all needs
refreshing...the sort of 'lets slow down the CPU clock speed and RAM
refresh rate until someone hits a keyboard' kind of thing costs money to
implement...and lots of people myself included simply leave th bloody
things on because parise be to microsnoit, they take too long to boot
anyway...and they poll things like mail servers, and ther are other
background tasks running all the time on a PC.
In short, depsite accepting all your points about switching speeds etc
etc I still maintain that PC's in practice don't Idle.
MA Electrical sciences, Cambridge :-)
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