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Old 07-25-2009, 07:12 PM   #1
MBA Whore
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Power Supply Cords - Did They Change?


I have an unusual situation.

I want to replace my current power supply. Its main connector is 20 pin. Upon examining it, I count 20 individual pins. Each of the 20 pin slots appear to have a wire coming out.

I ordered a replacement. Upon receipt, I looked at the pin slots and found one slot was completely empty.

This was it: http://www.rackmountpro.com/product....1376&catid=274

I sent it back.

I ordered another replacement. Upon receipt, I looked at the pin slots and found the same situation; one slot was completely empty.

This was it:
http://www.unityelectronics.com/prod.../ELT400AWT-ECO

I will be sending it back shortly.

Why are these newer power supply units like this?

Is it safe to use them with older motherboards?

My motherboard [ASUS p4s800 (atx)] has 20 pin slots. The current power supply has exactly 20 slots and all 20 are "filled".

I originally thought the 2 ordered power supplies were defective. Now, I am beginning to think otherwise. Do all new power supplies now have 1 "empty" pin slot?
 
Old 07-25-2009, 07:32 PM   #2
paulsm4
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Hi -

Yes, things have changed. It sounds like you've had a Close Encounter with an ATX2 PSU. This link might help:

http://www.helpwithpcs.com/courses/p...nc-pinouts.htm

PS:
This discussion might also help:

http://www.wirelessforums.org/alt-co...0-a-16114.html

Last edited by paulsm4; 07-25-2009 at 07:35 PM.
 
Old 07-25-2009, 07:36 PM   #3
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1.2.1. Key Changes for ATX12V Version 1.3
-5V removal: Guidance for 5V has been removed. This legacy voltage was in support of ISA add-in cards. ISA cards are no longer used for a majority of the industry, but custom applications my still exist, refer to Version 1.2 for 5V recommendations.


http://www.formfactors.org/developer...X12V_1_3dg.pdf
 
Old 07-26-2009, 12:53 PM   #4
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Wow...I you don't pay attention to motherboards for 5 years and they get all changy! Imagine that.

Thanks for the links.
 
Old 07-26-2009, 02:36 PM   #5
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I have an update. I found a picture showing my "19 pin" issue. No, it is not my picture. Someone else must have had a similar problem and posted his main connector online. The website did not answer my question, but does provide a picture to show:

http://forum.lowyat.net/index.php?ac...post&id=510406

Notice it is a 20 pin unit, but 1 pin slot is empty. You can even see light through it.

My questions:

Are these "19 pin" units safe for mobo designed for a "20 pin" unit?

Where can I find more related information?

I am googling as I type this, but google is large. If you know of any specific websites, then please direct me.

Thanks.
 
Old 07-30-2009, 02:21 PM   #6
bsdunix
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Do you have ISA cards? Based on the quoted text in my previous post, the missing pin was for ISA cards.

Here is some more info:

http://en.wikipedia.org/wiki/ATX
 
Old 07-30-2009, 04:10 PM   #7
NeddySeagoon
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MBA Whore,

The -5v supply has been provisioned but not used for a long time.
If you do not have any long black slots in your system, you will not need the -5v supply.
Even if you have these slots and they are used, yu probably will not need the -5v supply.

Other pins are in the same places as they always were, so yes, its safe.
 
Old 07-31-2009, 01:32 AM   #8
Electro
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Like others have said the 24-pin ATX power connector is backwards compatible. The 24-pin ATX power connector just adds additional 12 volt wires to handle the current load.

Some motherboards has no problems providing the -5 volts to devices that need it even if the power supply does not include it. Some motherboard manufactures may not include it, so double check if your motherboard has this feature when installing ISA devices.

80x86 based computers are still using the ISA bus. The ISA bus is just bridged with PCI bus. PS/2, sensors, communication ports, and many others uses the ISA bus.
 
Old 07-31-2009, 09:16 AM   #9
elprawn
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You can use a 20 pin in a 24 pin motherboard. Just leave the last few slots empty.
 
Old 07-31-2009, 11:30 AM   #10
cgtueno
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Hi

I suggest that you take a look at
http://www.playtool.com/pages/psucon...s.html#atx12v4

Chris
 
Old 08-01-2009, 09:22 PM   #11
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Ah....thank you all.
 
  


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