- How much eletricity does a modern pc use 24/7 ?
- Posted by amstereofan on August 26th, 2003
Can't be much but are we talking approx a £1 a day or somewhat less with
monitor off half the time say ?
- Posted by amstereofan on August 26th, 2003
Sorry OT: I meant to add :-)
"amstereofan" <listen_to_am_stereo@www.amstereoradio.tk> wrote in message
news:3f4bf58d@news.greennet.net...
- Posted by Colin Wilson on August 26th, 2003
You`d really need to figure out what the current draw is, but if you
assume a 300W power supply that isn`t going full pelt, lets say 240W for
ease of measurement, that`s 240W/240V=1A (note nominal voltage is now
230V, but you will find the limits are 230V +10%/-6% and are often
towards the high end - less transport losses for the supply company that
way)
1A for 1 hours = 1 unit of electricity, which is ~8p, so...
24*8p = £1.92
*plus* the juice the monitor uses while in use (often 80 to 100W)
Damn, and I run 2 of the feckers 24/7 - I might have to have a rethink on
that, but I factor in the failure rate of hardware when powering up,
especially that of HDs...
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- Posted by amstereofan on August 26th, 2003
Sounds more than I thought, how much less energy does a TFT run ?
"Colin Wilson" <btiruseless@btinternet.com> wrote in message
news:MPG.19b5e1e24a95a0b8989a84@news.individual.ne t...
- Posted by Mike @ www.lefkada-homes.com on August 26th, 2003
Colin Wilson <btiruseless@btinternet.com> wrote:
Eh ?
1 unit of electricity is 1,000 watts for one hour (1 KWh).
--
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- Posted by Richard Platt on August 26th, 2003
On Tue, 26 Aug 2003 22:30:43 +0100, Colin Wilson
<btiruseless@btinternet.com> wrote:
Surely not... 1A for 1 hour at 240V is 0.24kWhours. And 1kWh is around
5-6p. So that's closer to 1.5p an hour, 36 pence a day or a tenner a
month or so. Also, I'd be surprised if a PC actually used that much
power continuously, but then I haven't actually measured it.
--
Richard Platt
- Posted by Tiny Tim on August 26th, 2003
amstereofan wrote:
I don't know about an individual TFT display but my whole laptop is only
rated at 70W (marked on the laptop and the PSU) and that includes....
15" 1600*1200 TFT
Pentium III 900
nVidia Geforce2go 32MB
512MB
30GB 5,400 rpm
CD-RW
DVD-ROM
Builtin speakers
2 fans
- Posted by Tiny Tim on August 26th, 2003
Mike @ www.lefkada-homes.com wrote:
With my supplier, Amerada, 1kWh is 6p including VAT.
If PC/monitor use 333W continuously averaged over 24 hrs that's 8 kWh = 48p
per day.
If PC/monitor use 500W continuously averaged over 24 hrs that's 12 kWh = 72p
per day.
(If I've got my maths right)
- Posted by Bob Eager on August 26th, 2003
On Tue, 26 Aug 2003 21:30:43 UTC, Colin Wilson
<btiruseless@btinternet.com> wrote:
(let me first say that I wish this had been posted to an on-topic group,
as perhap some of these errors would not be posted). On-topic is GOOD,
for more than one reason...
Hmm....and that's 100% efficient...! However, I run 3 PCs and 2 monitors
and my 1000W UPS says it's about 30% loaded, so I'd say you're looking
at more like 150-200W.
, that`s 240W/240V=1A (note nominal voltage is now
Oh no it isn't. one kilowatt for one hour equals one unit. Forget abiut
volts and amps here...
So with your estimate, about 4 hours uses one unit (1000/250 => 4). I
actually reckon it's more like 200W and five hours. Say a unit is 8p,
then that's about 38p a day.
OK, but I would hope the monitor isn't on 24/7. It's the most likely
point of failure, the one thing that doesn't suffer much from power
cycling, and the biggest fire risk. So it should only be on when you're
using it.
Assume a fairly sad user who sits in front of their PC for 8 hours a
day, with 100W consumption. That's 0.8 KWh, or 0.8 units a day. Another
6.4 pence.
So, about 45p a day including a monitor on for about 8 hours a day.
These are all really approximate figures, of course.
Not the monitors, though....factor in the rebuilding cost for the house
aftre a fire instead!
--
Bob Eager
rde at tavi.co.uk
PC Server 325*4; PS/2s 9585, 8595, 9595*2, 8580*3,
P70...
- Posted by nick on August 26th, 2003
"Tiny Tim" <tim_dodd@hotmail.com> wrote in message news:bigkuk$92c15$1@ID-198854.news.uni-berlin.de...
17" monitor is 100-160w, pc is 80-400w (always on).
so min/max 180/560 4.32/13.44kWh
= 26/80p per day
=£94 /£294
more than you think. my pc wont even boot with less than 250watts.
- Posted by Colin Wilson on August 26th, 2003
Ahh boll*cks, I knew I had it wrong somewhere - i`m surprised I missed
that :-}
It didn`t seem right when I looked at it... :-}
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- Posted by Simon Finnigan on August 27th, 2003
Colin Wilson wrote:
Colin, what did you used to work as, I can`t quite remember. I`m sure it`s
something relevant to this discussion :-)
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- Posted by Matthew Haigh on August 27th, 2003
In article <3f4bde1b$0$241$fa0fcedb@lovejoy.zen.co.uk>, nick
<nick@no.spam> writes
But that isn't to say it uses 250W continuously - it just needs the peak
capacity during heavy usage (drives spinning up & being accessed,
intensive processor usage etc.). Whilst sitting there relatively idle
post-bootup it will be using a lot less.
Matt
--
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GCRSoft, providing SMS solutions since 1996...
http://www.gcrsoft.com http://www.moretext.com
- Posted by Ian G Batten on August 27th, 2003
In article <MPG.19b5e1e24a95a0b8989a84@news.individual.net> ,
Colin Wilson <btiruseless@btinternet.com> wrote:
Not necessarily. A power supply only draws the power that's being taken
from it. To take a real life example, a 750MHz Celeron in an Intel
integrated motherboard with a 5400rpm disk pulls 12.3% of a 420VA UPS,
or 52W. The PSU is rated at 145W (it's in a proprietory FlexATX case
with a dedicated UPS, hence my knowing the exact power consumption).
You also need to consider that in the winter you're dumping the power as
heat into the house, so you may save on power in other ways. Back in
the late eighties I had cause to run a Sun 3/60 in my kitchen for most
of December and January, and although my electricity wasn't small my gas
bill dropped significantly.
ian
- Posted by Greg Hennessy on August 27th, 2003
On 27 Aug 2003 10:12:08 GMT, Ian G Batten <I.G.Batten@batten.eu.org> wrote:
LOL! I knew someone who had a vax 11/780 in his garage, now that was a
*real* mans radiator ;-)
greg
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- Posted by nick on August 27th, 2003
im not sure it uses much less. cpu dissipates 90watts of heat.
and my gfx card, 9700, requires extra power from a 3.3v HD lead.
"Matthew Haigh" <$matthaigh{News03}$@haigh.org> wrote in message news:y3ZZuVbBFGT$EwZh@local.gcrsoft.com...
- Posted by Ian G Batten on August 27th, 2003
In article <3f4ca84e$0$228$fa0fcedb@lovejoy.zen.co.uk>,
nick <nick@no.spam> wrote:
When running flat-out, yes. Any remotely modern OS will idle the CPU
when it's not busy, and the temperature will drop markedly. The
temperature is pretty much a function of power consumption.
ian
- Posted by Mark Wheadon on August 27th, 2003
In article <is6pkvknuegp6h2pcf64gcdp0srgq6rees@4ax.com>,
Nigel Mercier ® <nigel.mercier2003NoSpam@virgin.net> wrote:
Presumably quite a bit of that's your monitor? The monitor will
hopefully be in power save most of the time if the PC is on 24/7.
Otherwise that would be about 260 quid a year for 24/7 running - ouch!
Mark
- Posted by belfast biker on August 27th, 2003
On 27 Aug 2003 10:12:08 GMT, Ian G Batten <I.G.Batten@batten.eu.org>
wrote:
That is the coolest heating system I've ever heard of.
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- Posted by dorothy.bradbury on August 27th, 2003
Less than you think, usually.
However for a dedicated Internet appliance, you can downsize:
o Low-Power CPU -- Skt-370 Celeron 1-1.2Ghz
o Low-Power HD -- Laptop HD
o Limited-RAM -- 128MB PC100
o No FD/CD -- or use SlimCD (eg, Teac CD-224E slimCD)
o Remote admin -- Linux, or TightVNC etc or use TFT when needed
That can get you down to <0.40A or <100W.
Taking it further you can go to "book-size":
o Mini-iTX footprint
o VIA C3 CPU + Laptop-style power-brick & DC-to-DC convertor
o Laptop HD or disk-on-a-chip
That can get you down to the <55W level - and be silent also.
The Skt-370 Celeron above can easily be made silent too.
Laptops can also be used to make Net appliances, and work ok.
At the 100W level you are at 70ukp/yr.
There have been some interesting "net appliances", based on low
power processors/chipsets/disk-on-a-chip/Linux - but poor pricing.
Plus the manufacturers stop doing updates etc.
Perhaps MSFT should have done a net.box instead of x.box, a simple
appliance with cut-down Win2k-Svr on it. Their marketing need to
remember if their heads in the sand, that's one thing - but the ass is
very often left sticking up in the air. Linux has on a Mini-ITX delivers,
and it's not lumbered with baggage from the operating system either.
CRTs can be power hogs, TFT less so - but CPUs have caught up.
Power use saved by the TFT has migrated into the graphics chipsets.
--
Dorothy Bradbury
http://homepage.ntlworld.com/dorothy...ry/panaflo.htm (Direct)
