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RE: via epia power -- initial test results

> -----Original Message-----
> From: Andrei Bulucea [mailto:]
> Sent: Friday, January 31, 2003 7:55 PM
> To: 
> Subject: Re: via epia power -- initial test results
>
>
> >I promised to post the results of my via epia (800MHz) power
> tests, so
> >here they are.
> >The two tests do not include possible losses from the power supply
> >were performed at the output of the power supply.
> >All results are with max amps.
>
> >POST consumption (just board with some ram)
> >14.19 watts
>
> Correct. This is what we got for the VIA MINI-ITX EPIA-800Mhz
> with a high
> efficiency 12V dc to dc converter (see
> http://www.mini-box.com/pw-60.htm)
>
> Power consumption: 9.6W/Idle 13.4W/MP3playback
> System was booted from a CompactFlash.
>
> Looks like when the board is in the BIOS mode or waiting to boot, it
> actually consumes a lot of power.

We've observed the same thing with various boards and cpus (mainly x86) that
systems at POST consume a significant amount more power then at idle after
an operating system has been loaded. I have yet to find a good explanation,
but I suspect it has something to do with the BIOS being in a busy polling
loop. If I remember correctly, some OSs like DOS look very similar.

-Paul

R. Paul McCarty
Vitronics Inc
tel: (732) 389-0244 x30
fax: (732) 544-9431

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