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Question about PCIe 8 pin cables

post #1 of 18
Thread Starter 
I am starting my first sleeve job. I have removed the cheesy sleeving that came with my PSU and found this...




Now I decided to do a little research on the wiring and found this diagram...


and this



Questions...

1) Are all the black wires common ground?

2) What is this "Sense" wire? Are they the same as ground?

3) Are the 3 +12v wires rated the same... In other words, does it matter which yellow is which or must they be in the same order they were from the factory?

The modular plug from the manufacturer obviously was short a few spots so they crimped several grounds together. I am planning to clean it up a little... perhaps have 2 doubles and a single black coming off the PSU. But I wanted to get some clarity from the OCN crowd before I do so.

Thanks
    
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post #2 of 18
Quote:
Originally Posted by SinatraFan View Post

I am starting my first sleeve job. I have removed the cheesy sleeving that came with my PSU and found this...


Questions...

1) Are all the black wires common ground?

Usually yes, exception being when all the wires are black

2) What is this "Sense" wire? Are they the same as ground?

It's a ground wire and because you can use whichever ground wire you want irrespective of position on the connector I'd say that if there are any sensors on the PCI-E connectors then they're likely to be on the Graphics card and not the PSU.

3) Are the 3 +12v wires rated the same... In other words, does it matter which yellow is which or must they be in the same order they were from the factory?

It doesn't matter which is used as long as 12V matches 12V and Ground matches Ground

The modular plug from the manufacturer obviously was short a few spots so they crimped several grounds together. I am planning to clean it up a little... perhaps have 2 doubles and a single black coming off the PSU. But I wanted to get some clarity from the OCN crowd before I do so.

The 'splicing'? on that connector looks a bit messy, was it covered with heatshrink as well as sleeve?

Thanks
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post #3 of 18
Thread Starter 
Yes, it was covered in heatshrink. I cut it off to see what the mess was underneath.

Ok, so if I hear you correctly...

1) +12v wires are all the same rating so they are interchangeable as long as they are in the same spot at the both ends.

2) Sense wire is a ground wire and can come from any of the black wires from the PSU

Confirm if I got that right or wrong, otherwise Cheers!
    
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post #4 of 18
Right, in both cases.
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post #5 of 18
Thread Starter 
Not to beat a dead horse, but let me run another scenario at you...

Since I wish to run multiple sleeve colors... I may need to rearrange the wires on the PSU side to provide for a pleasing appearance. So, compare the diagrams...







As you can see, all the yellows are still in the appropriate places on bot the PCIe sides and the PSU side. However, I am shifting some of the yellows from the top to the bottom row or visa versa. Is that going to be a problem???
    
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post #6 of 18
Thread Starter 
Hmmm... I just realized my drawing is a bit dyslexic on the PCIe side, but you get the basic idea.

Here are the corrected pics...




Edited by SinatraFan - 1/10/14 at 9:15am
    
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post #7 of 18
The principle of matching 12V to 12 V and Ground to Ground still applies. It doesn't matter where on the connector it is as long as the correct voltage or ground is matched. You can even take an equivalent feed from a different connector in a lot of cases (excluding 24 pin connector).

I've used a 12 pin connector intended for GPUs to create 6 separate 4 pin molex/auxiliary connectors for my pumps and LEDs to cut down on the number of connectors on the PSU.
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post #8 of 18
Thread Starter 
So if I hear you correctly, I could use one of the unused connectors and combine them so I don't have to dbl wires?
    
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post #9 of 18
You could and I've done it in the past for VGA connectors. However you need to get the wire lengths right or it can start looking messy.
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post #10 of 18
Thread Starter 
Quote:
Originally Posted by Big Elf View Post

You could and I've done it in the past for VGA connectors. However you need to get the wire lengths right or it can start looking messy.

Agreed... but I think this has to be better and easier to look good than lots of doubled up wires.
    
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