Question My new MOBO has 8 pin CPU power...PSU has 2X4Pin CPU?

[Ronstang]

Motherboard is an ASUS TUF Gaming Z690-PLUS WiFi D4 and there is an 8 pin CPU socket and a 4 pin CPU socket next to it. My PSU only has 2X4 pin CPU plugs. I don't need the additional 4 pin on the motherboard because I have no intention of overclocking. The 2 4 pin connectors will not plug into the 8 pin socket side by side like they did on my other motherboard, but one fits in the left 4 pins and the other 4 pin then fits in the additional 4 pin connector. That is how I have it because I had no other option today when I put this thing together. Upon boot it states to plug in the 8 pin connector for proper operation...but it boots and works fine.

Is there a cable that converts the 2X4 pin CPU connectors to the single 8 pin that is on this ASUS motherboard? I can't find one.

Thanks

 

[VirtualLarry]

Something is WRONG there, because the 4+4 ATX12V split plugs should properly fit into an 8-pin EPS12V socket.

 

[Ronstang]

Something is WRONG there, because the 4+4 ATX12V split plugs should properly fit into an 8-pin EPS12V socket.

That was my thinking, but I not only tried many time the second 4 pin would not go in and when I inspected it more closely the pins of the last 4 pins of the connector were not identical to the first 4 but rather a mirror image....so there is no way that other plug is going in there.

 

[VirtualLarry]

Yes, the other 4 pins are a mirror image. That should not prevent it from plugging in.

 

[Ronstang]

Yep, looked on my old motherboard and your right.....but I could not get the plug in my new mobo. I guess I will have to try again tomorrow when I can get the machine on it's side....but I couldn't get it in there with the mobo on the table outside the case so it's going to be a lot harder now. LOL

 

[In2Photos]

One of the 4 pin plugs may has a couple of "lips" on one side to help hold the other 4 pin in the socket after insertion. Make sure you install this one first, then install the other one to hold both parts in place.

Alternatively you could get an 8 pin EPS extension cable which would be easier to insert into the motherboard and then you would attach the 2 4 pin cables to it in the back of the case.

 

[Ronstang]

Alternatively you could get an 8 pin EPS extension cable which would be easier to insert into the motherboard and then you would attach the 2 4 pin cables to it in the back of the case.

IF there is a cable like this that I can actually plug my 2 4 pin connectors into then were do I find one....I searched but all I found were modular cables designed to plug directly into a modular PSU

 

[In2Photos]

IF there is a cable like this that I can actually plug my 2 4 pin connectors into then were do I find one....I searched but all I found were modular cables designed to plug directly into a modular PSU

There are plenty of cables like this.

Amazon.com : 8 pin eps extension cable

 

[Ronstang]

There are plenty of cables like this.

Awesome, thank you....but it appears I am just an incompetent boob....I tried on the table yesterday and it would not go in and when I looked at the shape of the socket being different I gave up but I just took out the top back fan and tried again and it's installed now.

USER ERROR

 

[In2Photos]

Awesome, thank you....but it appears I am just an incompetent boob....I tried on the table yesterday and it would not go in and when I looked at the shape of the socket being different I gave up but I just took out the top back fan and tried again and it's installed now.

USER ERROR

Glad you got it going!

 

[tcsenter]

Is that connector a "one or the other" proposition or intended to be used together? How is it possible that an 8-pin EPS+12V is not enough for a CPU? That thing supports apprx. 330W

 

[Ronstang]

Is that connector a "one or the other" proposition or intended to be used together? How is it possible that an 8-pin EPS+12V is not enough for a CPU? That thing supports apprx. 330W

On my ASUS TUF Gaming Z690-Plus WiFi D4 there is the 8-pin then right next to it is an additional 4-pin. Now you are correct that the 8-pin is more than enough for any modern Intel CPU and they will actually boot and run with only one 4-pin inserted into the left half of the 8-pin and the other inserted into the extra 4-pin because that is how I had it at first.....but I got an error message at boot telling me to use the 8-pin socket for safety.

I remember when there was only one 4-pin CPU power socket, then they went to two thus creating the 8-pin and then they added the extra 4-pin with recent CPUs. From my research you are correct about the wattage but the extra is simply extra overhead for overclocking. I assume that it is partially due to the increased heat probably increases wattage requirements due to increased resistance.....but that is pure speculation.

 

[BoomerD]

My MSI Z690 Tomahawk WiFi DDR4 board has two of the 8 pin CPU power connectors.

 

[tcsenter]

My MSI Z690 Tomahawk WiFi DDR4 board has two of the 8 pin CPU power connectors.

Just in case Intel might release a 180W+ processor I guess? Maybe it's the newer DrMOS stuff that is so high-speed it needs current distributed across many more pins/lines. 🤔

 

[CP5670]

They are way overbuilt as a way to charge more for the boards. Most X670E boards have two EPS plugs (each one does 300W, plus the 24 pin allows another 75W) and massively overkill VRMs that can deliver over 2000A in some cases, while the X3D CPUs use 50-100W at most.

 

[Brainonska511]

My MSI Z690 Tomahawk WiFi DDR4 board has two of the 8 pin CPU power connectors.

View attachment 79856

My B660 tomahawk board has the same setup with two 8-pin EPS. I hooked both up for the hell of it, but definitely overkill for the i5-12400 I'm using.