Question Plugging 6-pin EAXT 12V ?

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Are you sure the plug really fits. 6 pin atx 12v is strange thing.

Video cards use what is called PCIE which is has a different layout than atx. They are keyed to prevent you from actually plugging the wrong things in. Both might be 8 pins but plastic housing are different. You will see some are square and other have a rounded top.

Google is being bad this morning can't link the best image I found to show this.

Looking a the manual the 6 pin connector on that motherboard looks like the 8 pin ATX connector with 2 pins removed. It is not the same as video card.

Now technically everything is just 12 volts or ground on both types of connectors so you could get a adapter and run a motherboard off a video card connector. You need to be very careful the plastic pins are keyed to prevent people from destroying their equipment by connecting voltage and grounds to the wrong stuff.
 
bill001g said:
Are you sure the plug really fits. 6 pin atx 12v is strange thing.

Video cards use what is called PCIE which is has a different layout than atx. They are keyed to prevent you from actually plugging the wrong things in. Both might be 8 pins but plastic housing are different. You will see some are square and other have a rounded top.

Google is being bad this morning can't link the best image I found to show this.

Looking a the manual the 6 pin connector on that motherboard looks like the 8 pin ATX connector with 2 pins removed. It is not the same as video card.

Now technically everything is just 12 volts or ground on both types of connectors so you could get a adapter and run a motherboard off a video card connector. You need to be very careful the plastic pins are keyed to prevent people from destroying their equipment by connecting voltage and grounds to the wrong stuff.
Click to expand...
yes it fits without problems. Middle uper in my VGA plug is "rounded" but rounded fits into "squares" and it made me curious. I want to plug it becasue I have problems with PCIe adapters for NVMe drives, BIOS doesnt detect it and I thought may be becasue this plug is mandatory to power those PCIe slots? (GPU on this slot with its own power supply is working fine)
 
I wouldn't do it. If you look at the different connectors you will see the 12 volts and ground are reversed. Almost worst case you can think of. The big 24 pin connector has lots of ground connectors and then you hook 12 volts to the ground on the 8 pin . You can fry the traces on the motherboard as burn out your power supply. It is basically a direct short.
 
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bill001g said:
I wouldn't do it. If you look at the different connectors you will see the 12 volts and ground are reversed. Almost worst case you can think of. The big 24 pin connector has lots of ground connectors and then you hook 12 volts to the ground on the 8 pin . You can fry the traces on the motherboard as burn out your power supply. It is basically a direct short.
Click to expand...
Im not sure what you mean. Isnt it reversed becasue its not meant to plug traditional atx (this 6 pin is another reason, Ive not seen 6 pin atx)? I thought I would fry this if I plug traditional atx connector because its reversed, and I thought maybe thats why this VGA plug works but I cant find in PSU manual how those ground connectors are on this VGA plug. I've also found this picture https://egpu.io/forums/expresscard-...on-exp-gdc-beast-expresscard-to-6-pin-of-gpu/ and it shows its exactly the same as in this manual, all 12v are down and ground is on upper row
 
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That is one of the 2 connectors. All the links that have both on the same diagram refuse to link even though they show in the google image search.

Look fr EPS-12v or ATX-12v. These are the ones that are used for CPU power.

On these connectors the 12 volt is on the top....ie near the plastic clip

If you look at the photo of the motherboard and then compare the pattern of square and rounded top pins to the diagrams. It does not match the pcie/vga cable. It look like the cut 2 pins off the eps-12v connectors.
 
bill001g said:
That is one of the 2 connectors. All the links that have both on the same diagram refuse to link even though they show in the google image search.

Look fr EPS-12v or ATX-12v. These are the ones that are used for CPU power.

On these connectors the 12 volt is on the top....ie near the plastic clip

If you look at the photo of the motherboard and then compare the pattern of square and rounded top pins to the diagrams. It does not match the pcie/vga cable. It look like the cut 2 pins off the eps-12v connectors.
Click to expand...
I'm not sure if we understood each other. Unfortunately, I can't attach screenshots. In the manual, on page 37, there is an EATX12V_1 plug labeled with the letter 'D.' This connector has the ground and 12V pins flipped upside down, and it is a 6-pin connector. After searching for '6 pin GPU diagram,' I found images that show the same layout as the 'D' EATX plug in my motherboard. In these images, all the ground pins are in the upper row, which matches the layout in the manual. That's why I wanted to connect the GPU connector to this port, as it also fits physically.
 
Wow that is strange. I did not see this page where they marked the voltages. If you were to take the 8 pin connector on the top and cut off the left 2 pins it would fit but the voltages are wrong.

The pattern on the top row is square/square/round.

A VGA connector the patter is round/round/square.

It should not be possible without force to plug the video cable connector into that jack.

In theory at least if the motherboard manual is correct then if you forced a 6 pin video connector into that slot it should work.

I would be very afraid of what happens if this is a misprint in the manual. I would try to find another source that confirms this
 
A idea that might help. If you have a volt meter test for continuity between the pins. Hard to say if the 12 volt are connected but all the grounds on a motherboard should all be connected. If the diagram is correct the top connectors of the 6 pin in question should have extremely low resistance to the bottom row of pins in the more standard 8 pin connectors.
 
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Much to my surprise, it would appear your X99 motherboard does indeed have a 6-pin header marked EATX12_1 which is compatible with a 6-pin PCIe power cable normally used with graphics cards. This would probably explain why the 6-pin mobo header is "keyed" to fit the 6-way PCIe powercable.

The other two 8-pin headers EATX12V and EATX12V1 both have their +12V pins on the opposite (normal) side, i.e. they conform with the EPS12V standard keyway pattern.

My guess is the motherboard designer needed three +12V feeds and since most "standard" ATX PSUs have only one or two EPS12V power cables, they decided to use a PCI Express (GPU) cable for the third mobo input. Unusual, but understandable.

CAUTION

If you match up the yellow (+12V) wires in the ATX PSU connectors (see link below) with the pins marked +12V on the three motherboard headers (page 1-37), i.e. EATX12V, EATX12V1 and EATX12_1, before applying power, you should be good to go. If you have any doubts, seek further advice.

https://superuser.com/questions/849...nce-between-8-pin-eps12v-and-pci-e-connectors
 
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