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MB has 8 pin and 4 pin for CPU power?

Tazz 316
By Tazz 316
in CPUs, Motherboards, and Memory
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I'm looking at the new Asus ROG X570 Crosshair VIII Hero i got the other day and it has a 8 pin and a 4 pin connector at the top of the board my previous build only had the 8 pin. They are labeled eatx12v_2 and eatx12v_1.

 

Are they both used?

1.jpg

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The 8 pin is required, the 4 pin is optional, but completely irrelevant if you're not going to be LN2 overclocking.

The 8 pin already does 384W, which is more than plenty for any CPU on the platform.

 

Any quality PSU will come with an 8 pin, some with another 4+4 pin too. These are the EPS connectors.

"We're all in this together, might as well be friends" Tom, Toonami.

 

mini eLiXiVy: my open source 65% mechanical PCB, a build log, PCB anatomy and discussing open source licenses: https://linustechtips.com/topic/1366493-elixivy-a-65-mechanical-keyboard-build-log-pcb-anatomy-and-how-i-open-sourced-this-project/

 

mini_cardboard: a 4% keyboard build log and how keyboards work: https://linustechtips.com/topic/1328547-mini_cardboard-a-4-keyboard-build-log-and-how-keyboards-work/

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They are both used by the board but you dont have to use 4pin when you already have the 8pin in there

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1 minute ago, Jurrunio said:

They are both used by the board but you dont have to use 4pin when you already have the 8pin in there

I have a corsair RM850x, i don't think it even has a 4 pin. The CPU is a 3900x my first AMD.

 

Thanks for the quick replies!

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5 minutes ago, minibois said:

The 8 pin is required, the 4 pin is optional, but completely irrelevant if you're not going to be LN2 overclocking.

The 8 pin already does 384W, which is more than plenty for any CPU on the platform.

 

Any quality PSU will come with an 8 pin, some with another 4+4 pin too. These are the EPS connectors.

This.

 

If you have a spare 4 pin to plug in, sure, go ahead. It will reduce the resistance in the wire as you would be spreading the load out over more wires, but, its totally not required. The 8 pin can provide WAY more power than required. But, since the mobo has it, if your PSU can support is (son't spend money on an extra cable if you don't already have it as that isn't at all worth it), go ahead and use it.

Rig: i7 13700k - - Asus Z790-P Wifi - - RTX 4080 - - 4x16GB 6000MHz - - Samsung 990 Pro 2TB NVMe Boot + Main Programs - - Assorted SATA SSD's for Photo Work - - Corsair RM850x - - Sound BlasterX EA-5 - - Corsair XC8 JTC Edition - - Corsair GPU Full Cover GPU Block - - XT45 X-Flow 420 + UT60 280 rads - - EK XRES RGB PWM - - Fractal Define S2 - - Acer Predator X34 -- Logitech G502 - - Logitech G710+ - - Logitech Z5500 - - LTT Deskpad

 

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3 minutes ago, Tazz 316 said:

I have a corsair RM850x, i don't think it even has a 4 pin. The CPU is a 3900x my first AMD.

 

Thanks for the quick replies!

It does actually.

image.png.9a5d42fd2de01f2ff59c5f1f673cf4b8.png

1 connector per cable, 2 cables.

It's an 8 pin/4+4 pin. The 8 pin can split into 2 4 pin connectors:

cable3_close.jpg

"We're all in this together, might as well be friends" Tom, Toonami.

 

mini eLiXiVy: my open source 65% mechanical PCB, a build log, PCB anatomy and discussing open source licenses: https://linustechtips.com/topic/1366493-elixivy-a-65-mechanical-keyboard-build-log-pcb-anatomy-and-how-i-open-sourced-this-project/

 

mini_cardboard: a 4% keyboard build log and how keyboards work: https://linustechtips.com/topic/1328547-mini_cardboard-a-4-keyboard-build-log-and-how-keyboards-work/

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