4 pin ATX cable too short, converted cable not helping.

FearedPirate · May 21, 2014

I recently purchased a new case for my pc but now my 4pin atx will not reach the top left corner of my motherboard. I purchased a 4 pin molex to 4 pin ATX conversion and connected it to my extra power cable for a secondary HDD but when I turn on my pc it does not load. Before I moved all the pieces into the new case my system worked fine. Is this an issue where It is not getting enough power from the conversion cable and I need to run an extension directly from the 4 pin coming from the motherboard or is this a bigger issue? Any help with this would be greatly appreciated. Thanks.

clutchc · May 21, 2014

If you are extending the 4 pin CPU power cable, you need one of these: http://www.newegg.com/Product/Product.aspx?gclid=CNr_iJy5vr4CFWNgMgodrngAZg&Item=N82E16812123300&nm_mc=KNC-GoogleAdwords&cm_mmc=KNC-GoogleAdwords-_-pla-_-Internal+Power+Cables-_-N82E16812123300&ef_id=U3p1iwAABHUpvh1F:20140522020734:s

What were you using? Can you post a link to it?

FearedPirate · May 21, 2014

clutchc :

I am using this http://t.tigerdirect.com/products/2293170 to connect from a 4 pin that would be used for a second HDD to my CPU 4pin ATX port.

I have already ordered the cable you listed. I am just hoping to be able to use my pc in the mean time.

clutchc · May 21, 2014

That is the wrong cable. But if it is wired properly, it should have worked. If it was wired incorrectly, it may have fried your MB or CPU. Check to make sure both yellow and both black wires end up at the same pins as the correct power cable from the PSU that is too short.

It will depend on how your PSU has the +12V rail wired to determine if their is sufficient current carrying capacity for the CPU. It takes more than most peripherals that a Molex would power.

I'd wait until you get the right cable.

hunter315 · May 21, 2014

Wow, that cable is an awful idea, i didn't know those existed. Stop using that one and use a real 4 pin extender. Molex connectors are great for simple cheap things that are relatively low current, your CPU could be pulling 10A through those pins which is quite a lot, quite a lot more than i would trust a molex connector to handle safely, molex explicitly does not guarantee their crimps so they really aren't well suited for high current applications.

As for the issue at hand, what PSU do you have? If it has that short of a cable arrangement i'm betting it is also of the era where the CPU was on its own rail so the other rails likely don't have a ton of juice behind them. If you shifted most of the load over to a single rail you could be exceeding its OCP and tripping the PSU off.

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4 pin ATX cable too short, converted cable not helping.

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