On Mon, Oct 10, 2016 at 07:52:49PM +0100, Patrick O'Callaghan wrote:
> On Mon, 2016-10-10 at 11:42 -0500, Mike Chambers wrote:
> > On Fri, 2016-10-07 at 16:35 +0100, Patrick O'Callaghan wrote:
> > >
> > > As I said, I'm happy enough with suspend for now. My aim was to
> > > reduce power consumption at night (this isn't a server that has
> > > to be on all the time).
> >
> > I dont' think computers use that much power (least normal workstations
> > anyway) to bring up or down your utility bill much, so couldn't you
> > just leave it on as is and just shut off your monitor until your ready
> > to use it again?
>
> I used to do that up until about a year ago. Since then I think I have
> noticed a reduced utility bill, but of course that's not really
> evidence as there are other factors, including lower rates because of
> the drop in oil prices. This is an i7 system with an Nvidia card, an
> SSD, a 1TB SATA drive and 16TGB of RAM, so probably above average for
> home workstations in terms of power consumption. The monitor is a 23-
> inch HP LCD.
>
> If there were an easy way to measure it I would :-)
I can put some numbers on the discussion. I checked my electric bills
for the last 6 months and the rate is about 8500 Watt-Hours for $1.
As there are 8766 hours in a year, that means for me, a continuous draw
of 1 watt will cost about $1/yr.
My UPS has a front panel display that can show watts drawn. Besides the
computer and monitor, the only thing plugged into the UPS is an ethernet
switch and a cordless phone charger.
My system is a little larger than Patrick's; a 6 core i7, overclocked to
4.0GHz, 32GB RAM, 2 SSD's plus 2 2TB rotaters, nVidia card and 24 inch
LCD monitor. Much larger than I need, but I only buy one every 8-10 yrs.
Here is the power draw from the UPS under 3 conditions:
Computer idling, cpu's at 1.1GHz 110 Watts
Monitor on but blank
Computer idling, cpu's at 1.1GHz 150 Watts
Monitor lit
All 6 cores plus 6 hyper-thread 280 Watts
cores running at 99% usage at 4.0MHz
One SSD active, no rotaters active
Monitor lit
So for me, at my electric rate, keeping this computer on 24/7 costs
me about $100/yr. YMMV!
Jon
--
Jon H. LaBadie jonfu@xxxxxxxxxx
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