Did i mess up?

[itslit]

this is for motherboard 

 

They look slightly different from each other. My motherboard is a B450 Aorus Elite, and the PSU is an RME750. The CPU cable that plugs into the PSU looks correct one for mobo, but I can’t plug it in the other way around.

 

this cable goes to psu 

[NumLock21]

Look at the label on the plug, if there is any

[itslit]

1 minute ago, NumLock21 said:

Look at the label on the plug, if there is any

it says cpu.

[NumLock21]

2 minutes ago, itslit said:

it says cpu.

Look at your PSU side for the same name and plug into that.

Try switching sides for the cable.

[seon123]

A rounded pin can fit inside a square hole. What's the issue? You won't be able to see it, so the way it looks doesn't matter.

[itslit]

9 minutes ago, NumLock21 said:

Look at your PSU side for the same name and plug into that.

Try switching sides for the cable.

The PSU connector has a locking tab, while the connector on the motherboard is wider and dual, meaning they cannot be swapped or connected to each other, as they are one-way only.

[NumLock21]

Just now, itslit said:

The PSU connector has a locking tab, while the connector on the motherboard is wider and dual, meaning they cannot be swapped or connected to each other, as they are one-way only.

Is your PSU Corsair?

[itslit]

3 minutes ago, seon123 said:

A rounded pin can fit inside a square hole. What's the issue? You won't be able to see it, so the way it looks doesn't matter.

Sure, it might physically fit, but shouldn’t all the pins be aligned properly for it to function as it’s supposed to? Doesn’t each pin have its own function?

[itslit]

3 minutes ago, NumLock21 said:

Is your PSU Corsair?

Yes RM750e

[mariushm]

The key on the 8 pin connector on the motherboard is for the EPS connector. 

 

The 8 pin connector on the Corsair power supply is custom keyed to work in both EPS connectors AND to be possible to split it in two and plug one part of the connector into the ATX 12v connector on motherboards.  Without this custom key, you wouldn't be able to plug it in 4 pin header on motherboard.

 

So it's normal to not match.

 

EPS (CPU 8 pin) is like this (if you have the cable from power supply in your hand and you're looking at it)

 

 

The 12v 4 pin CPU connector is this one (again, pretend you have the cable in your hand and looking at the plug) :

 

 

 

So the cable with connector that splits into 2 parts,  the right side will go in both the EPS-12v and the ATX-12v headers on motherboard.

 

[NumLock21]

17 minutes ago, itslit said:

Yes RM750e

The side where the plug can be split into 4pin + 4pin this is for your motherboard, as long as it can be plugged in, you're fine.

The other end will be for the PSU, just plug into any one of the ports that's under PCIe/CPU.

[itslit]

This is my motherboard’s layout, and the old PSU had 2 clips like shown.

This is the PCI-E/CPU universal input on the PSU, with the same exact pins as my motherboard, but since this is on the PSU, I can’t plug this part into my motherboard.

“The cable from the power supply should go to the motherboard, but as I marked, the pins are not exactly the same and it doesn’t fit into the EPS12V above.”

[podkall]

What's the problem again? It doesn't really seem clear what's wrong

[itslit]

29 minutes ago, podkall said:

What's the problem again? It doesn't really seem clear what's wrong

29 minutes ago, podkall said:

What's the problem again? It doesn't really seem clear what's wrong

The pins on the CPU cable from the PSU are not identical to the ones on the motherboard. The first image shows the pins on my motherboard, while the third image illustrates the pins on the cable that’s supposed to connect to the motherboard. The middle image shows the pins on the modular end of the cable, which connects to the PSU. I’m pointing out that the pins on the modular side and the motherboard are identical, but the CPU end that needs to be connected to the motherboard is different. And i am asking if they are compatible.

 

 

[podkall]

32 minutes ago, itslit said:

The pins on the CPU cable from the PSU are not identical to the ones on the motherboard.

of course, one needs to plug into the other

 

32 minutes ago, itslit said:

The first image shows the pins on my motherboard, while the third image illustrates the pins on the cable that’s supposed to connect to the motherboard. The middle image shows the pins on the modular end of the cable, which connects to the PSU. I’m pointing out that the pins on the modular side and the motherboard are identical, but the CPU end that needs to be connected to the motherboard is different. And i am asking if they are compatible.

If that's the cable that came with MB, and it writes EPS or CPU on it, it's the right cable.

 

If it plugs into the motherboard, it's the right cable, try it.

 

Make sure the PSU isn't on and in power while plugging everything else of course.

[itslit]

8 minutes ago, podkall said:

of course, one needs to plug into the other

 

If that's the cable that came with MB, and it writes EPS or CPU on it, it's the right cable.

 

If it plugs into the motherboard, it's the right cable, try it.

 

Make sure the PSU isn't on and in power while plugging everything else of course.

There was no cable that came with the motherboard. The cable says it’s for the CPU, and the right side looks like it’s for the CPU, but as I mentioned, they don’t look identical. I haven’t tried plugging it in, but I’m sure it will fit. However, I’m curious if it will work properly. For example, in an ATX 24-pin connector, every pin is different from the others, and I’m wondering if the same applies to my situation. The motherboard’s pins look like two identical 4-pin connectors, but my cable looks a bit different. Firts 4 pin is same but other 4 is cutted edges

[itslit]

Actually, my question might be: are the square and rounded edge pins the same, or is there any difference between them?

[podkall]

12 minutes ago, itslit said:

There was no cable that came with the motherboard.

I meant with PSU, that was my bad

 

12 minutes ago, itslit said:

The cable says it’s for the CPU, and the right side looks like it’s for the CPU, but as I mentioned, they don’t look identical. I haven’t tried plugging it in, but I’m sure it will fit.

if it fits it belongs there, it's the one that came with PSU then right?

 

13 minutes ago, itslit said:

For example, in an ATX 24-pin connector, every pin is different from the others, and I’m wondering if the same applies to my situation.

you mean like the angle of the metal inside? that doesn't matter really

 

 

[mariushm]

Dude, as I explained, they're not identical on purpose

 

D pins in the plug can go in D pins or square pins in the header. 

 

Square pins can only go in the square pins in the header.

 

Your motherboard header is this :

 

 

It's basically this  ... I'll use circle instead of the D shape, because just like the D shape goes into a square, circle goes into the square.

 

◯ ☐  ☐ ◯

☐ ◯◯ ☐

 

Your 2 x 4 pin connector is this :

 

 

Which is made of two parts (drawn flipped, like when you'd plug the connector into the header) :

 

◯ ◯  and ☐ ◯

◯ ◯         ◯ ☐ 

 

Now let me bring the header again

 

◯ ☐  ☐ ◯

☐ ◯  ◯ ☐

 

The part with 4 circles can plug into either half of the header, because circle fits into the square.

The part with the square and circles can still fit but only on the right side of the 8 pin header of the motherboard (the one colored purple).

 

So by making the 2x4 plug different slightly they're making the plug idiot proof ... they don't want end user return the power supply because their motherboard has only a 4 pin header and they pin the wrong half of the 2x4 connector to plug into the motherboard.

 

At the same time, the plug is stil keyed to be different than 8 pin pci-e connector which looks like this:

 

 

 

 

☐ ☐◯ ◯

◯◯◯☐

 

You can't plug the 2x4 connector accidentally in the video card because the pin square colored red won't go in the circle colored with red above

 

◯ ◯  and ☐ ◯

◯ ◯         ◯ ☐