On Sat, Apr 27, 2002 at 05:06:40PM +0000, Brian J. Beesley wrote: > In terms of P90 CPU hours per kWh, we've got to be looking at P4 Northwood > based systems - equipped with minimum peripherals. The main power saving that > most people can make is to use an LCD monitor instead of a CRT.
Better still, switch the monitor off when you're not using it :-) I'm amazed at work at how many monitors seem to be on permanently, not even entering power-saving mode. What a waste - at least a CPU can do something more useful than providing visual entertainment for the spiders. I estimate that my personal system uses a little under 100W with monitor switched off, equating to about UKP1.00 a week at my electricity costs. This system is Duron 700, twin hard disks but one kept powered down by default (primarily on grounds of noisiness!), modest graphics card compared to a lot of modern systems, CDRW and DAT idling - fewer peripherals etc and you might save a few watts, maybe another 10W if you can manage without any disk spinning permanently. The power consumption of the CPU is supposedly around 30W under load - modest compared to recent Athlons or 0.18 micron P4s. > A 15" LCD monitor will use 150W-200W less power than a 17" CRT which has > a similar visible screen size. There's a worthwhile saving in desk space > as well. I did the calculations a few months ago and it's actually a saving of around 100W (my 17" Iiyama claims to take 130W, 15" LCDs seem to take around 30W). I used this to show that replacing CRTs with LCDs purely to lower power bills wasn't yet economic. (And 1024x768 resolution isn't enough for me anyway :-) -- --------------- Robin Stevens <[EMAIL PROTECTED]> ----------------- Oxford University Computing Services ----------- Web: http://www.cynic.org.uk/ ------- (+44)(0)1865: 273212 (work) 273275 (fax) Mobile: 07776 235326 ------- _________________________________________________________________________ Unsubscribe & list info -- http://www.ndatech.com/mersenne/signup.htm Mersenne Prime FAQ -- http://www.tasam.com/~lrwiman/FAQ-mers
