Do I need another ATX12V 4+4 connecter for x99 Mobo?

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luketexas

luketexas

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Sep 14, 2015
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Hi. Im building an x99 i7-6800K build

My power supply is Cooler Master V650 and motherboard is Asus x99 A-II

My question is that the power supply only has one 4+4 ATX12V power cable, but my motherboard's manual states my mobo needs another 4 pin ATX12v for the board. (x1 8pin, x1 4pin for 12v CPU power).

I've seen many builds with exact same specs as mine, and no where on the internet can I find anyone whos asking about an additional 4 pin 12v power cable, which my motherboard clearly needs..
The PSU has space for another x2 ATX12v connections, but they aren't included in the box and I can't find anywhere online to purchase another one.

What can I do?

EDIT: I've found molex to "ATX12V 4pin" adapters, but Im not sure if I should be running CPU power from the SATA power section of the PSU. The PSU manual says the Molex has 12v power, ground, ground then 5v. But the CPU power rail seems to provide 12v's all round.
 
Solution
Zerk2012
The pins on the adapter match the regular 4 pin ATX.
Common and ground are the same thing.
The 5V wire on the Molex is not used it will have 2 wires from the 12V molex to the 4 pin ATX. Looking like this note their no wire comming fron the 5V on the molex...
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luketexas

luketexas

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Sep 14, 2015
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Thanks for the generic link, as stated I've already found those adapters..

The PSU manual specially states the supplied power by each pin within each connector.
It says:
CPU 4+4 PIN is made up of-
Pin1-GND
Pin2-GND
Pin3-12v
Pin4-12v

AND FOR THE MOLEX
Pin1-12v
Pin2-com
Pin3-com
Pin4-5v

My question is whether or not it matters, and I'm almost 99.9% sure that it DOES MATTER if I use the molex when it's meant to be 12v all round.
 
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Zerk2012

Zerk2012

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The pins on the adapter match the regular 4 pin ATX.
Common and ground are the same thing.
The 5V wire on the Molex is not used it will have 2 wires from the 12V molex to the 4 pin ATX. Looking like this note their no wire comming fron the 5V on the molex.
https://www.google.com/imgres?imgurl=http%3A%2F%2Fd2ydh70d4b5xgv.cloudfront.net%2Fimages%2Ff%2Fa%2Fcoboc-lp4atx4-6-6-4-pin-molex-lp4-to-atx-12v-p4-4-pin-cpu-auxiliary-power-adap-4c2ff3daba80e4e9a9bbf99ec49f4df1.jpg&imgrefurl=http%3A%2F%2Fwww.terapeak.com%2Fworth%2Fcoboc-lp4atx4-6-6-4-pin-molex-lp4-to-atx-12v-p4-4-pin-cpu-auxiliary-power-adap%2F302043801077%2F&docid=AkHOdryPrL7dBM&tbnid=-h5fKecPF9JU6M%3A&vet=1&w=500&h=375&client=tablet-android-verizon&bih=768&biw=1024&q=molex%20to%204%20pin%20cpu&ved=0ahUKEwifyejYhNvRAhUQ0GMKHTuUA2QQMwhBKAswCw&iact=mrc&uact=8
With that said yes it will work but I had much rather have a power supply that has the proper connectors.
 
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Solution
luketexas

luketexas

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Sep 14, 2015
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Thanks for the response! I looked into it and I believe the extra 4 pin connector on the mobo for the CPU is mainly for use if the CPU is overclocked? So at stock core speeds, I assume the extra power won't be needed.
I can either sell this PSU and get one that has another 4 pin on the 12v rail or I can use the adapter.
 
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