-=PCTechTalk=- Re: Power Supply

You've got it.  In the case of this PS, they opted to underrate the wattage 
rating.  That's truly commendable!  Many makers will use the larger number 
to impress, even though all of that power will never be available at the 
same time.

The video card will get its power through dedicated leads and will not take 
up any of the precious molex connectors you'll need for the rest of those 
devices.  Regardless, you will still want to work towards balance at all 
times.  Any time you add something new or replace one thing with something 
of more or less power needs, you'll want to reevaluate the arrangement to 
promote a new balance.

The +12 is the main supply of power to a system's devices.  It is also the 
only one you will need to concern yourself with.  The rest of them pretty 
much handle just one or two items that are present in every system or 
contain plenty of headroom to handle anything you might throw at them, so 
those values are already optimized (and not split across more than one 
rail).  If you research the juice carried on each & every pin of all of the 
connectors in your system, you'll find that the +5v is included in most of 
them.  It's often used to power an LED or something that only sips a little 
bit of juice from the PS.

You can probably see by now why I prefer single rail PS's, but that still 
doesn't prevent me from using or recommending multi's on occasion.    :)

Peace,
Gman

http://www.thevenusproject.com/index.php

"The only dumb questions are the ones we fail to ask"

----- Original Message ----- 
From: "dsw32952" <dsw32952@xxxxxxxxx>
To: <pctechtalk@xxxxxxxxxxxxx>
Sent: Wednesday, May 27, 2009 12:24 AM
Subject: -=PCTechTalk=- Re: Power Supply


> Power in WATTS is equal to Amps times volts.  So the two 12 volt rails
> share the 552 watts.  I don't know how they get that figure since 12 x
> 25 plus 12 x 25 equals 600.  If you add the 5v + 3.3v times 25 amps you
> get 207.5 watts and then  the -12 at .3 amps is 3.6 watts plus the 5vSB
> at 2.5 amps for 12.5 watts everything adds up to
>
> 600
> 207.5
>   3.6
> 012.5
> ---------
> 823.6 WATTS.
>
> I assume that is max peak wattage and the 700 watts number is more like
> a normal or continuous load.
>
> I gather from your comments that most common devices in a computer use
> the 12v rails.  I will eventually have a SATA BlueRay player and a nice
> single video card with HD capabilities added to the existing SATA DVD
> burner, USB card reader, 500GB and 160GB SATA hard drives.
>
> Since it is unlikely that both opticals would be in use at once I figure
> the mobo and a hard drive on one and the other harddrive and both
> opticals on the other. There is no floppy.
>
> I assume those other voltages are for things like the video card and
> will likely have no concern about balancing the load across them????
>
> What else might be put in a computer that would I would need to concern
> myself over what rail to put it on?
>
> Don 

---------------------------------------------------------------
Please remember to trim your replies (including this sentence and everything 
below it) and adjust the subject line as necessary.

To subscribe, unsubscribe or modify your email settings:
http://www.freelists.org/webpage/pctechtalk
OR
To subscribe to the mailing list, send an email to 
pctechtalk-request@xxxxxxxxxxxxx with "subscribe" in the Subject. To 
unsubscribe send email to pctechtalk-request@xxxxxxxxxxxxx with "unsubscribe" 
in the Subject.

To access our Archives:
http://groups.yahoo.com/group/PCTechTalk/messages/
http://www.freelists.org/archives/pctechtalk/

To contact only the PCTT Mod Squad, write to:
pctechtalk-moderators@xxxxxxxxxxxxx

To join our separate PCTableTalk off-topic group, send a blank email to:
pctabletalk+subscribe@xxxxxxxxxxxxxxxx
---------------------------------------------------------------

Other related posts: