Yes, juice usage tracks demand. And switching supplies ARE efficient. 
But, assuming the 300w unit is a good one, it will requires less juice
to power itself than will the 800w unit. 

90% efficiency is possible. 80% may be the median achieved in the
current broad market.

said Harry, stirred by:
     Wayne 's message of:
     Wednesday 18 Jan 06 at 01:26 PM,
     On: Re: [OS2HW] Antec NeoPower 480
     [echoed below, at least in part]

--------
** Reply to note from "Harry
Travis" Tue, 17 Jan
2006 08:57:31    -0500 
>    
> Unless you are using the recent 2500 mhz cpus and a recent high 
> performance video card, you are way overpowered. The devices you mention 
> draw under 20 watts under power. The video card and CPU I mentioned draw 
> >50 or even >70 when running flat out. Did I mention a substantial audio 
> amplifier on a card ($>100) under the hood, too?) 
>    
> You will pay more, and continue to pay more in electricity and air 
> conditioning costs. There will NEVER be a time when even all the devices 
> you mention are running at once.  
 
This is not strictly correct.  If I have a 800W PS & components draw
150W then the  PS will draw not much more than 150W.  This how the
switchmode works.  If running  costs is important then look at PS
efficiency ie. over 90% efficiency would be your  mark.  And they do
exist. 
 
HTH 
Wayne 
 
 
>    
> You need a QUALITY 300 watt PS, at most.  
>    
>    





 
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DemostiX
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