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Total Newb question about how to hook up PSU

Last response: in Components
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May 22, 2013 12:59:24 AM

So I'm doing my first build right now with a Corsair CX500 and I've got motherboard and GPU in and all that business. I'm now looking to hook up my PSU but I'm not sure about how to use the cables. For instance, I have two "cords" of SATA power cables coming out. One has two SATA connects on it, the other has three. Should I hook both my optical drive and HDD in to the cord with three connectors? Should I run one cord to my optical and the other to my HDD? I also have the stock exhaust fan on my case with two molex (one male, one female) ends coming off of it besides the 3-pin mobo connection it has. How do I hook those up? I feel like every cable has two or three ends and it is confusing me to no end. I'd appreciate any help as I don't want to plug it in all wrong and blow my first build :/ 

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May 22, 2013 1:14:27 AM

You can't go wrong with SATA/Molex - anything goes anywhere.

As far as the fan goes, I think that you would only plug either the 3-pin into your mobo for speed control/monitoring OR the molex into your PSU for plain full speed running. It will have passthrough so you can stack more fans/other things off one connector.

Only thing you could possibly blow (and even then it's a possibly) is having both the 3pin and molex fan connectors plugged in and the mobo not liking it.

Just make sure you didn't mix up EPS12V and 8-pin PCIe.
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May 22, 2013 1:24:27 AM

Someone Somewhere said:
You can't go wrong with SATA/Molex - anything goes anywhere.

As far as the fan goes, I think that you would only plug either the 3-pin into your mobo for speed control/monitoring OR the molex into your PSU for plain full speed running. It will have passthrough so you can stack more fans/other things off one connector.

Only thing you could possibly blow (and even then it's a possibly) is having both the 3pin and molex fan connectors plugged in and the mobo not liking it.

Just make sure you didn't mix up EPS12V and 8-pin PCIe.


Thanks for the quick reply!

Only PCI-e I'm using is a 6 pin on my GPU (MSI R7770) with the little two pin piece hanging free. Does that sounds right?

Also, there is one more cord with a little 4-pin connector (floppy drive?) at the end and about 5 molex connectors on it. Any idea what this is intended for?

Since my PSU isn't modular, I'll have unused cords. Should I just bundle these neatly and tuck them away in the case somewhere? Or is there a better solution?
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May 22, 2013 1:27:35 AM

Yup, that's right. Make sure that the EPS12V plugged in by your CPU isn't another 6+2 pin PCIe though - it should have yellow on one side, black on the other, and split into 4+4. Course, if it's ATX12V, you're fine.

You got it - floppy. Very seldom used now.

Into an empty drive bay is the usual solution.
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May 22, 2013 1:34:00 AM

Someone Somewhere said:
Yup, that's right. Make sure that the EPS12V plugged in by your CPU isn't another 6+2 pin PCIe though - it should have yellow on one side, black on the other, and split into 4+4. Course, if it's ATX12V, you're fine.

You got it - floppy. Very seldom used now.

Into an empty drive bay is the usual solution.


I've got a big 24 pin cord going in to the mobo next to CPU. I did just notice an 8-pin plugin on the mobo up near the rear ports. Does the need to be plugged in as well? From the looks of the mobo manual that powers the CPU... I should probably plug that in.

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May 22, 2013 1:53:25 AM

Yeah... you should. It won't boot without it. Make sure it's the 4+4 pin one.
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May 22, 2013 2:38:50 AM

Someone Somewhere said:
Yeah... you should. It won't boot without it. Make sure it's the 4+4 pin one.


Booted just fine, first try. Installing Windows now. Thanks for walking me through it!
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