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Processors

kaminari_hanshi
Journeyman III

Ryzen 5 2400g Pin CPU power connectors required on the motherboards.

Hello. I will buy an Asus Prime B450m-a/csm motherboard which has 8 pin CPU power connector and I have a Ryzen 5 2400g, also I have a Gigabyte B700H Power Supply 700W which has 4+4 CPU power connector. 

I bought a 700W PSU because further upgrades like high-end graphics card.

So my question is:

Do I need to connect 4+4 CPU connector to give the necessary power to my Ryzen 5 2400g?

Or

It is enough if I only connect  4 pin CPU from my pSU instead of 8 pin?

The manual says>

Compatible with Intel standard ATX 12V V 2.31

COmpatible with tha EPS 12V V2.93

How much power does Ryzen 5 2400g require?        I know it gives 65W TDP but I do not know how does it work on PSU.

Thanks in advance.

21 Replies
misterj
Exemplar

Re: Ryzen 5 2400g Pin CPU power connectors required on the motherboards.

kaminari_hanshi, my opinion is to connect them all - that is why the MB vendor put them there.  You can ask ASUS for another opinion.  Enjoy, John.

kaminari_hanshi
Journeyman III

Re: Ryzen 5 2400g Pin CPU power connectors required on the motherboards.

I really appreciate your response John. I asked same to Asus Tech support and they told same than you.

The ASUS Agent answer was> We really recommend you to connect all pins to the motherboard regardless wether the CPU like Ryzen 5 2400g is low power consumption it can not cause any damage if you connect all of them.

Regards.

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andres_paiva
Adept II

Re: Ryzen 5 2400g Pin CPU power connectors required on the motherboards.

I have the same problem as you.

My motherboard is a Gigabyte B450M DS3H with an 8-pin connector, and my PSU is a Corsair CX550M (semi-modular).

The problem is that only one of the pins 4 + 4 that comes out of the PSU is compatible with the connector of the motherboard, the other does not.

Can the processor work 100% with only one connector (4 pins) connected? Or do I have to change PSU?

Thanks

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elstaci
MVP

Re: Ryzen 5 2400g Pin CPU power connectors required on the motherboards.

You can always purchase a Motherboard Power connector adapter to connect the PSU to the Motherboard.

Something similar to this at Amazon: https://www.amazon.com/StarTech-6in-Pin-Power-Adapter/dp/B002O21XHQ 

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andres_paiva
Adept II

Re: Ryzen 5 2400g Pin CPU power connectors required on the motherboards.

OK, I'm going to look for it.

But in the meantime, can the processor run games and applications 100%?

That is my existential doubt.

Thanks again.

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elstaci
MVP

Re: Ryzen 5 2400g Pin CPU power connectors required on the motherboards.

The 8 pin Power connector is what give power to the CPU.

Some motherboards have both 4 & 8 Pin Aux Power (CPU) connectors. But the 8 Pin you should be connected. 

In fact, according to your Motherboard Manual, The computer will not Boot up if the 12v (8 Pin CPU Power ) is not connected. This is from your Manual:

So you must have that 8 Pin power connected otherwise the computer will not boot up.

NOTE: I have attached your Motherboard's Manual for you to download by clicking on the attached file in this post.  It probably is outdated as far as BIOS goes but the rest of the information is still valid.

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andres_paiva
Adept II

Re: Ryzen 5 2400g Pin CPU power connectors required on the motherboards.

Thanks for the manual.

But, in fact, the PC turned on and it is working.

I do not understand how a simple thing like a connector, which should be universal, can give so much trouble. Especially because I bought components of a certain quality, the PSU is a Corsair.

I'm confused, it's the first PC I build. I do not want to spoil any part.

I guess I have to check the Ryzen manual to find out what the power requirements are.

As I read in some forums, the processor is low power, and can work with only 4 power pins.

This is correct?

Thanks again.

Greetings from Rosario, Argentina.

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elstaci
MVP

Re: Ryzen 5 2400g Pin CPU power connectors required on the motherboards.

I would definitely install the entire 8 Pin connector instead of one 4 pin. The Manual says you should have the 8 pin connected.

Some MoBos have two CPU Power connectors. 4 Pin and 8 Pin. In most cases the 4 Pin is not really needed unless you are going to Overclock or the CPU is going to be under very heavy loads but the 8 Pin must be connected.

Since you Mobo has only one 8 Pin CPU Power connector I definitely would connect it instead of just one 4 pin connector on a 4+4 Power connector.

Connecting one of two 4 pins connectors might give just enough power to the CPU to boot but could cause problems under heavy use.

It is your call. But I would purchase the 8 pin adapter for your PSU rather than take a chance on your Ryzen having consequences due to having only one of two 4 pins CPU power connected when the manual says it needs the 8 pins connected.

The Manual I posted is the same one for your motherboard, correct?.

NOTE: I have a Corsair 850 Watt PSU which I purchased about 6-8 years ago and it still is working great. When I upgraded my GPU I needed to purchase a 6 pin to 8 pin GPU Power adapter for my new GPU Card because my PSU didn't have that particular cable.

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andres_paiva
Adept II

Re: Ryzen 5 2400g Pin CPU power connectors required on the motherboards.

I think you do not understand me, I do not express myself well in English.

I do not need an adapted from 4 to 8 pins, because my PSU already comes with an 8 pin output (4 + 4).

The problem is that the output has 2 connectors of 4, one of which is compatible with the connection of the motherborad, while the other does not.

I do not know what to do.

PD: a graphic ilustration here.

Anotación 2019-06-23 185153.jpg

PD: Actually, the red connector fits, but not exactly, because the rounded ones fit inside the squares.

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