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PSU Extension actually impact on high load system.

post #1 of 6
Thread Starter 

I had those NZXT Premium Sleeve extension cable on all connection for my PSU HX750. It has been months that I've monitoring my voltage dropping low 3.1 to 2.9 volt on system load (3.3v rail) other are fine 12v stays constant, 5v drops a bit down to 4.8v.

 

For the past many months of overclocking now left me wonder about something. I had lots of bsod from overclocking, unstable voltage including GPU PCI-E power cable. Today, I finally decide to remove the extension and have it directly plug from the bare cable.

 

My 3.3v rail suddenly back up to 3.32~v Stress test and etc everything looks perfect. I know software is not accurate but it made a difference!

 

Question it, was all the BSOD caused by my bad extension? Probably yes. 

 

I thought it was my PSU, or bad GPU or bad CPU getting degrade. It wasn't. It was the dam extension!

 

 

 

Back to normal!

 

 

I'm going to buy the sleeving and ATX Removal Tool to mod my cable instead of using extension.

 

 

1. Extension extend the distance which gives more resistance?

2. Bad quality extension...

     
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post #2 of 6
Extentions should not give a voltage reduction. These extentions are way to short to distort voltages.. I think this is just coincidence.
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post #3 of 6
The only thing that I can think of would be either way way too skinny a gauge of wire or more likely the pins not making full contact, the latter of which would cause a very significant increase in resistance and could drop voltage.

That said, I would never rely on software voltage monitoring, it's at best inaccurate and at worst completely wrong.
I have used my Fluke DMM to test the voltage at the end of the cable, both with and without BitFenix extensions, and the voltage is within a few thousandths ie margin of error.
   
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post #4 of 6
Extensions that are done right will not mess with voltages,

What does is a couple things:

1. if the extension is super long (over 50in) I keep them under 50in to be safe, however I have done longer with no issues.
2. wire AWG should at least be 18AWG or 16AWG
3. Bad crimps and/or damaged wire.
post #5 of 6
and 4. pins are rated for max 30 mating cycles, so if you plug and unplug them a lot, then eventually there will be damage enough to cause some change in performance. There's some test results documents on Molex website, but I'm not sure how to make a conclusion from the data.
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post #6 of 6
Thread Starter 

I went back to the extension and test it again. 3.312v without the extension and 3.296v with the extension.

 

The funny things is only the 3.3v rail affected, and possibly a bad or worne out extension. :/


Edited by djriful - 10/16/13 at 5:21pm
     
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