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 Post subject: Adapter for 4-pin Molex connector to 15-pin SATA power
PostPosted: Thu Jan 23, 2014 11:38 am 
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Joined: Thu Mar 01, 2007 9:21 am
Posts: 31
Location: Ogema, WI USA
I am getting ready to build a new PC and already have some of the parts lined up. My power supply has three SATA power connectors, and that is enough for now, but I was thinking that somewhere down the road I may need one or two more. My first thought was that I could use an adapter that goes from a 4-pin Molex connector to two SATA power connectors, like this one:
http://www.ebay.com/itm/IDE-4Pin-to-SATA-15Pin-Y-Splitter-15cm-hard-disk-Power-Supply-Extension-Cable-/121171230862?pt=US_Drive_Cables_dapters&hash=item1c365e408e
I don't foresee using the 4-pin Molex connectors for any other purpose anyway, and this power supply comes with two of them. The problem is that when I look at the pinout of the Molex connector, I see +12v, com, and +5v. The SATA power connector is supposed to supply those voltages that I just mentioned, plus +3.3v. How can that adapter work correctly if there will not be a +3.3v source going to the SATA power connector?


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 Post subject: Re: Adapter for 4-pin Molex connector to 15-pin SATA power
PostPosted: Thu Jan 23, 2014 11:57 am 
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Joined: Fri Aug 05, 2005 3:29 am
Posts: 1152
Location: UK
The +3.3v line is part of the SATA technical standard but was never implemented by hard drive manufacturers. So the adapter will work fine.


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 Post subject: Re: Adapter for 4-pin Molex connector to 15-pin SATA power
PostPosted: Thu Jan 23, 2014 12:07 pm 
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Joined: Thu Mar 01, 2007 9:21 am
Posts: 31
Location: Ogema, WI USA
Thanks for the info, lodestar. I just finished searching around and pretty much found the same answer in this thread:
http://www.tomshardware.com/forum/291776-28-make-molex-sata-adapter

So, I guess I will go ahead with it and not be concerned about the 3.3v issue.


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