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I need to connect two 4-pin molex connectors to the backplane of my NAS (Silvstone DS380) but the PSU i use (Seasonic SS-250SU) did only come with one Molex connector.

Since i don't want to put all the current needed while spinning up (8 7200RPM HDDs) through one molex connector with an Y-cable at the end i thought it might be possible to convert a ATX12V connector into a 4-pin molex. The PSU has two of these ATX12V (to combine them into a 8-pin) but my motherboard (ASRock E3C224D4I-14S) only uses one.

I have seen adapters that combine two 4-pin molex to one ATX12V 4-pin connector, so i gathered that should be possible also the other way round.
But how would i do that?

used items: PSU (mine only has one 4-pin molex): http://www.seasonic.ru/products/items/30
case: http://www.silverstonetek.com/product.php?pid=452
motherboard: http://www.asrockrack.com/general/productdetail.asp?Model=E3C224D4I-14S

rezeptpflichtig
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1 Answers1

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Can i convert a ATX12V 4 pin into a 4 pin molex (IDE)?

The answer is "no".
The ATX12V has only one supply voltage among its four pins: two pins for 12V (yellow wire) and two pins for GND (black wire). The Molex connector (for the HDD) also has four pins, but has two supply voltages. It has one 5V pin (red wire), one 12V pin and two GND pins.
The ATX12V connector is not going to provide you with a 5V pin.

I have seen adapters that combine two 4-pin molex to one ATX12V 4-pin connector, so i gathered that should be possible also the other way round. But how would i do that?

You "gathered" incorrectly.
The conversion you refer to uses only half the pins of two Molex connectors, and leave half the pins unused.
If you want to do the reverse conversion, you would need to start with two spare 5V and two GND pins as well as the ATX12V connector.

sawdust
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