[wplug] Since we're off topic

Brian S. Woolstrum woolstrum at cmu.edu
Wed Feb 4 13:54:50 EST 2004


Yup, afterwords.  Sorry, had too many things going on and
too many windows open and that one got lost in the shuffle
of google searches.   Once I did read though, (and realized
the horror of what I'd done) that page definitely has a
great thorough explanation.

On Wed, 4 Feb 2004, Vanco, Don wrote:

> Date: Wed, 4 Feb 2004 12:58:54 -0500
> From: "Vanco, Don" <don.vanco at agilysys.com>
> Reply-To: wplug at wplug.org
> To: "'wplug at wplug.org'" <wplug at wplug.org>
> Subject: RE: [wplug] Since we're off topic
>
> Uhhhmmmm...  did you read the URL I included - that was precisely the
> point.....
> http://tinyurl.com/3953x
>
> wplug-admin at wplug.org wrote:
> > One thing nobody seems to be taking into consideration is
> > that while the overall wattage maybe a certain value, the
> > individual parts don't pull their power from that one
> > overall large source.  Instead everything gets branched
> > off.
> >
> > To give an overly simplified example, let's say that
> > a 300 watt power supply is split into three branches.
> > One for each of 3 different voltage levels, +3.3 volts, +5
> > volts, and +12 volts.  And lets say that the power is
> > distributed equally to each of those branches, so 100 watts
> > on each one.  Now, say for instance that your system is
> > using 30 watts from the +3.3, 95 watts from the +5, and 10
> > watts from the +12 for a total of 135 watts.  Now you want
> > to add something that needs +5 volts, and is going to draw
> > 15 watts.  We can't just say that 135+15=150 which is only
> > half of our 300 watt power supply so we're good.  What will
> > happen is there will now be 110 watts being drawn from a
> > branch that can only support 100 watts, and something could burn
> > out.  So in this case a 200 watt power supply could be
> > sufficient if the power were divided up slightly different.
> >
> > On Wed, 4 Feb 2004, Vanco, Don wrote:
> >
> >> Date: Wed, 4 Feb 2004 11:52:18 -0500
> >> From: "Vanco, Don" <don.vanco at agilysys.com>
> >> Reply-To: wplug at wplug.org
> >> To: "'wplug at wplug.org'" <wplug at wplug.org>
> >> Subject: RE: [wplug] Since we're off topic
> >>
> >> someone @wplug.org wrote:
> >>> 	And what kind of CPU do you have in this? Anything over 800Mhz,
> >>> your 300-watt power supply, is just not going to cut it.
> >>
> >> 	Not necessarily a true statement.  See:
> >> http://tinyurl.com/3953x
> >>
> >> 	I have a 300Watt supply that runs a system that a "bargain" 450
> >> could not.
> >>
> >> YMMV
> >> Don
> >>
> >> PS:
> >>> Don't bother with 40-gig disks. Go with 80s or 120s. Buy online!
> >> 	CompUSA has a sale currently - 160GB 7200RPM 8MB cache for $89.00
> >> after rebates (and $.01 delivery if you purchase enough $$).  Just
> >> got two - "TiVo to DVD" really eats up the space!
> >> _______________________________________________
> >> wplug mailing list
> >> wplug at wplug.org
> >> http://www.wplug.org/mailman/listinfo/wplug
> >>
> >
> > Brian S. Woolstrum   KB3KJH
> > Principal System/Software Engineer
> > Carnegie Mellon University Libraries
> > 4909 Frew Street, Hunt Library
> > Pittsburgh, PA  15213
> > 412-268-2317
> >
> >
> > _______________________________________________
> > wplug mailing list
> > wplug at wplug.org
> > http://www.wplug.org/mailman/listinfo/wplug
>
> _______________________________________________
> wplug mailing list
> wplug at wplug.org
> http://www.wplug.org/mailman/listinfo/wplug
>

Brian S. Woolstrum   KB3KJH
Principal System/Software Engineer
Carnegie Mellon University Libraries
4909 Frew Street, Hunt Library
Pittsburgh, PA  15213
412-268-2317





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