-=PCTechTalk=- Re: Power Supplies was: Re: Re: SATA power connectors
- From: Gman <gman.pctt@xxxxxxxxx>
- To: <pctechtalk@xxxxxxxxxxxxx>
- Date: Mon, 2 Feb 2009 14:37:49 -0500
Replies below.
Peace,
Gman
"The only dumb questions are the ones we fail to ask"
http://www.bornagainamerican.org
----- Original Message -----
From: "Don" <dsw32952@xxxxxxxxx>
To: <pctechtalk@xxxxxxxxxxxxx>
Sent: Sunday, February 01, 2009 11:39 PM
Subject: -=PCTechTalk=- Power Supplies was: Re: Re: SATA power connectors
> Sounds more like Pandora's box.
>
> May I try to relate this "rails" stuff to something I might understand?
> Like track lighting.
>
> Some tracks might be capable of attaching several lights but have a
> circuit
> breaker capacity that will limit the number based on how much power each
> one
> requires. A 5 amp CB could theoretically support 12 each 50 watt lights
> or
> 6 each 100 watt lights or 4 each 150 watt lights. Or the same CB could
> support 2 each 300 watt tracks or 4 150watt tracks or any combination that
> does not exceed the 600 watt (5 amp) capacity.
>
> Can a "rail" be thought of like a "track"?
Yes, a rail can very much be related to a track in the sense that you're
using it.
> How do you determine which connectors are on which rail and how much each
> rail can support?
Read the info at the maker's site or in the manual that comes in the
retail box
> How many and what rating would a "typical" 300 watt power supply might
> have?
Impossible to answer. Even among a single PS maker's products, you'll find
some supplies that employ a single rail design and some that utilize a
multiple rail approach. The advertised PS rating (300W in your case) is
actually the total and includes the available power on ALL of the lines
(+3.3V, +5V, +12V, -12V). How that power is broken up depends on the design
of that specific PS. Head over to the maker's site and you should be able
to look up the distribution.
> Any guess as to the power demands of a typical mid to large capacity
> internal hard drive? USB hard drive? DVD burner? MoBo?
I have a WD 60G drive in front of me that needs 0.8A @ 5V (4W) & 0.45 @ +12V
(5.4W) for a total of 9.4W. I got these figures off of the sticker on top
of the drive itself. Both voltages are delivered through the single molex
connector.
http://www.pc-user.co.uk/power_connectors.htm
> This is more complicated and probably entails a lot more research than I
> ever thought it would. :(
>
>
> I'll touch on the rest of your reply later. Its bed time. Yep. Even on
> vacation there is a bedtime!
>
> Don
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