Modular PSU cable confection

[Lerixo]

Hello and good afternoon.

 

I have a bit of an more specific problem rn, i will just speak it out so you will know where im standing.

 

I finally got my hands on a fitting crimping wrench and now im starting my project i wanted to do a while ago.

Currently i have a bequiet! power zone 750W modular PSU, and a while ago i wanted to craft my own cables for it. The procedure seems simple, if you won't switch some pin out wrong.

The  thing is:

 

The power inlet on my components are: 24pin ATX - 8 + 6 pin EPS - 8 + 6 pin Pcie.

 

What bothers me is that: My PSU has a 20+8 pin outlet for the 24pin ATX connection, an 12pin outlet for pcie, and a 10pin outlet for my EPS. Sooooo you kinda see the problem right now i'd guess. 

 

As i have no idea how the pinout is, except the position, or how many cables are really needed, or even doubled...... or have insight about the real electrical specs of my PSU, im asking if anyone ever built their own cables for a modular PSU, and if so, if you could give me an idea andor knowledge about how this works. I should be ablet to logically figure it out then.

 

I will add a picture of the slots on my PSU.

Greets - Lerixo

[paddy-stone]

Edible PSU cables ????

 

 

[Lerixo]

To confect something is the serial production of something, but also yes. Something edible

[Princess Luna]

9 minutes ago, Lerixo said:

i wanted to craft my own cables for it.

Uh why?

 

Cablemod is a thing if you want something to stand out but what you're looking into doing sounds a lot of hassle and cost with potential failure for not particular reason.

[Lerixo]

Yeah like i buy a cable kit for 150 bucks, if the parts for it are around 30 bucks.   

[mariushm]

You have 20+8 on one end and 24 on the other because some of those wires on the 20+8 side are sense wires : the power supply sends power through 24 wires (well, 23 really, because -5v is no longer used) to the motherboard and there's a few wires going all the way to the connector and attaching themselves to ... probably 3.3v, 5v and 12v. These wires are like multimeter probes going from the power supply to the motherboard.

If the motherboard sucks a lot of energy, there may be some bit of voltage drop on the cable between the power supply and motherboard - let's say instead of 12v you would have 11.9v.

The power supply measures this 11.9v through one of those extra wires and reacts, and it raises it's output to around 12.1v so that at the other end of the cable the motherboard will see 12v.

That's why the number of wires is not the same on both sides.

 

It's good for voltage stability but it sucks because it's harder to crimp one pin to two wires (and usually the sense wires don't have to be thick as they don't carry current so sometimes manufacturers use thinner AWG20 wires for these.

 

[Lerixo]

Thanks! That really explains the situation on the ATX side. I should be able to just reverse engineer my current cables then, as all wil be sleeved piece by piece, to get a good result. What still bothers me is the difference between the EPS and pcie pins, as i get more pins on the inlet side, then on the outlet. I might be able to do it the same as with the ATX, and take it apart, but some info would be great too.

[Lerixo]

Ok im just using my ohm meter and check with ports on the psu side lead to the ends of my plugs. Thanks marius.