Power consumption in desktop computers

[Per Engelbrecht]

Hi Martin and the rest of you
Due to a regulation on watt pr. squaremeter (=heat) in the
datacenter we use (InterXion) we have spent a lot of time finding new
boards, cpu, psu, ram et al for the servers we use for dedicated
serverhosting. All items are measured with different kinds of 'Fluke'
volt-meters and on differnt places. Don't know if you folks can use
it, buthere goes:

CPU (Intel P4 2,4)        63Watt
CPU (Intel Celeron 2,2)        54Watt
PSU (150Watt with ~70% allocated to 3,3V and 5V) +20-30% on power-on!
RAM (Kingston pc2700 512MB)        2,5Watt
BOARD (ASUS and DFI onboard LAN, 32MB video, sound) 25Watt
DISK (IBM and Seagate ATA133, 40GB) 12Watt
CDrom        none

A complete "server" has a total of:
Wake-on-LAN        8watt
Idel                42-54watt
Max load        92-109watt

Beware of the ekstra powerconsumption on power-on! You can expect an
ekstra 20-30% on power-on caused by the various circuits on the
board, but not least in the PSU.
This is only a feature if you work with 16amp feeds (or any other
power-feed) and are on the egde of max - then you have to take the
ekstra20-30% in account so that you can power all servers up at once, if
needed.
Best regards

/per
per at xterm.dk



> Tim Kientzle wrote on Sun, Dec 28, 2003 at 11:22:10AM -0800:
>>
>> Ouch!  I've tested a bunch of 'business-grade' desktops around
>> my office, and they all run 40-60 watts during normal use (not
>> including monitor) with peak power at boot time up to 70-80
>> watts. This includes some P4s with lots of memory, CD-RWs, etc.
>> (The one exception is an AMD Duron system; it seems that
>> the AMD processors are uniformly power-hungry.)
>
> I wonder how that works.
>
> I finally got ahold of a datasheet of P-4 power consumption:
>
http://support.intel.com/support/processors/pentium4/sb/CS-007999.htm#Table2>
> The least hungry P-4 takes 48.9 watts (1.30 GHz), the current
> 3.20 and 3.06 GHz models take 82 watts.
>
> Add the mainboard and the efficiency loss in the power supply.
>
> Are these business-grade ones maybe equipped with mobile P-4s?
>
> Martin
> --
>
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
> Martin Cracauer <cracauer at cons.org>
> http://www.cons.org/cracauer/
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