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New PSU Rail Balancing

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#1 Shindy


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Posted 16 November 2008 - 02:36 PM

The New PSU would be this:

Now, this new PSU includes TWO rails. Unlike the epic fail Delta 300W that came with this computer, it has TWO 12v rails with 17A on each. Since I've never worked with duals before (infact, I have never worked with power supplies before >.<) I'll need help on distributing loads.

On my GT5432 computer, there are:
AMD Athlon 64 X2 5000+ @2.6GHz
Integrated Nvidia Geforce 6150SE
Unknown DVD/CD R/W
a USB Hard Drive Bay
1Gig Memory (512MBx2)

Now normally this PSU can power all those on a single rail. But heres the catch. I'm adding in the following:

EVGA Geforce 8800 GS 384MB
1 Gig Corsair Memory single stick

Now, I heard that 8800's take about 12A. That leaves me 5A on a single rail, and probably would not want to add in everything else into that single rail. I couldn't find out the amperage of others, so I'm asking.

So, if you kindly please, in format of:

(list hardwares here)
(list hardwares here)

list the hardwares there so I dont nuke my system.

P.S.: One 4 Pin leads to DVD Drive, 15-pin Sata leads to HDD, 20-pin leads to MOBO, 4 Pin leads to CPU, and an unknown pin leads to the USB Drive Bay. Will connect 6-pin to 8800 GS.


Another question, how do you know which cables belong to which rails (on the PSU's, I heard my PSU will have an abnormal # of cables and no sleeving at all, go green...)

Edited by Shindy, 16 November 2008 - 02:39 PM.

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#2 Sterling14


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Posted 16 November 2008 - 03:41 PM

Welcome to bleepingcomputer!

You have nothing to worry about. With multiple +12V rails, think of them as a single +12V rail. That power supply has a total of 34amps, and both rails can juice the same item.
"I think there is a world market for maybe five computers." - Thomas Watson, Chairman of IBM, 1943

#3 dpunisher


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Posted 16 November 2008 - 03:53 PM

It's not like you are going to have a huge say in how the power is split. The ATX connector/4pin/EPS/ and PCI-E connectors will already be laid out by the manufacturer. You can't pick your rails on those. The only thing I worry about is keeping the CPU and video card on different rails, which is something the power supply will determine for you by it's connectors. Your power supply does have 2 PCIE connectors, and there may be a choice for you to make as to which one to use.

Here is something I ran across:

8800GS-136watts idle, 172watts load, 185watts peak

That is the total system draw for a dual core Intel, HD,motherboard and 2 gigs of memory, before power supply inefficiency is factored in, so the actual draw is about 80% of the above listed. I don't think you need to lose sleep over your rail distribution. You got plenty.

I am a retired Ford tech. Next to Fords, any computer is a piece of cake. (The cake, its not a lie)

3770K @4.5, Corsair H100, GTX780, 16gig Samsung, Obsidian 700 (yes there is a 700)

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