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  Max length of an ATX 20pin power cable? 
 
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Shawn Langley Jul 28, 2009, 04:29am EDT Reply - Quote - Report Abuse
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As the title suggests i've hit a very hard brick wall, it seems 60cm is too long which is a big problem, any ideas on how long it actually can be? a quick google has been unhelpful.


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Chris M Aug 01, 2009, 12:38am EDT Reply - Quote - Report Abuse
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>> Re: Max length of an ATX 20pin power cable?
What kind of problems are you experiencing? Over long distances you'll have degradation of voltage but at 60cm I would assume change is negligible.

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Shawn Langley Aug 01, 2009, 01:43am EDT Reply - Quote - Report Abuse
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>> Re: Max length of an ATX 20pin power cable?
Ill see if I can explain this in an understandable way....

With the extension of 60cm the machine will barely boot usually it will just loop the monitor flickers on and off quickly when eventually it does boot the graphics are horribly distorted looking similar to it over heating.....

Now if I take out the extension and plug PSU directly in it appears fine and boots fine... It also boots fine with the extension if I put a graphics card that has its own molex to draw power from or a lesser card like a 9200SE. Of course I have tested the particular card in another machine also working fine.

It only faults when in this machine with a long ATX cable drawing power through the AGP slot I can only assume this is the problem therefore.

As for why the image below explains it better, the main atx plug from the PSU goes into a plug on the lid of the tank and the extension brings the power to the mobo in the bottom right corner.
http://s684.photobucket.com/albums/vv201/blackhawk1uk/?action=...oto106.jpg

The cable itself its a 6" extender spliced with extra cable in middle I have checked all 20 connections for continuity and they don't have any massive difference in resistance.

The only option I can see is to use a card with a molex input or to shorten the cable and hope it works I think i can shave maybe 15cm off it but it will be a very taught cable once installed. Of course that is if I have the problem nailed that is.......

Having voices in your head is normal. Listening to them, common. Arguing, acceptable. However, when you lose the argument, you're in trouble.
Dr. Peaceful Aug 01, 2009, 02:17am EDT Reply - Quote - Report Abuse
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Edited: Aug 01, 2009, 02:20am EDT

 
>> Re: Max length of an ATX 20pin power cable?
Is that like a fish tank PC project? Or something like that.

I found an article about PSU cable length, may be of use to you.
http://www.anandtech.com/casecoolingpsus/showdoc.aspx?i=3159&p=3

Looks like they do have PSU with 50cm to 60cm cable length for the 24pin plug. So your 60cm requirement shouldn't be a problem.

Shawn Langley Aug 01, 2009, 04:15am EDT Reply - Quote - Report Abuse
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>> Re: Max length of an ATX 20pin power cable?
>.< Thanks for the link,

But that leaves at square one again, any ideas what's causing this?

Having voices in your head is normal. Listening to them, common. Arguing, acceptable. However, when you lose the argument, you're in trouble.
~Vel Aug 01, 2009, 04:53am EDT Reply - Quote - Report Abuse
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>> Re: Max length of an ATX 20pin power cable?
Probably too much resistance along the wires. You may need a modular PSU.

Shawn Langley Aug 01, 2009, 06:49am EDT Reply - Quote - Report Abuse
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>> Re: Max length of an ATX 20pin power cable?
~Pulls out the wallet~ thank god its pay day tomorrow

But I will try shortening the wires and possibly changing the type I used although it was a very similar gauge to the original if that fails ill look into a new PSU with longer/modular wiring

Having voices in your head is normal. Listening to them, common. Arguing, acceptable. However, when you lose the argument, you're in trouble.
mothow Aug 01, 2009, 02:03pm EDT Reply - Quote - Report Abuse
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Edited: Aug 02, 2009, 10:12pm EDT

 
>> Re: Max length of an ATX 20pin power cable?
about ten feet..lol


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Chris M Aug 02, 2009, 09:06pm EDT Reply - Quote - Report Abuse
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>> Re: Max length of an ATX 20pin power cable?
~Vel said:
Probably too much resistance along the wires.


This was my conclusion as well. Is the wiring used for the splice a higher gauge? Are you making good contact at the splice point?

--
It is said that when it comes to life, those who feel see it as a tragedy. Those who think see it as a comedy.
Shawn Langley Aug 03, 2009, 02:11am EDT Reply - Quote - Report Abuse
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>> Re: Max length of an ATX 20pin power cable?
Its of a very similar gauge maybe ever so slightly thicker, it was used for wiring up speakers. And the joints are soldered pretty well and the have been heatshrinked individually and then covered in blue cable wrap.

Having voices in your head is normal. Listening to them, common. Arguing, acceptable. However, when you lose the argument, you're in trouble.

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