Only 8 pin power with i9 12900k?

[RyRyJS]

I just purchased a i9 12900k. When putting everything together I realized that the mobo has a 8pin + an extra 4 pin connector for the cpu power. I know the 12900k takes a lot of power. My 850w power supply doesn’t have an extra 4 pin connector anywhere. I won’t be overclocking. Do I need the extra 4 pin? Would it be a nice to have? Thanks 

[dilpickle]

It should be fine. What mobo?

[RyRyJS]

5 minutes ago, dilpickle said:

It should be fine. What mobo?

Asus TUF gaming z690-plus ddr4

[YoungBlade]

What power supply do you have? I'd be surprised if a modern 850W didn't come with at least 2 CPU power connectors.

[RyRyJS]

3 minutes ago, YoungBlade said:

What power supply do you have? I'd be surprised if a modern 850W didn't come with at least 2 CPU power connectors.

It’s a hx850i. Couple years old. It has two 8 pin cpu connectors but no 4 pin. 

[YoungBlade]

Just now, RyRyJS said:

It’s a hx850i. Couple years old. It has two 8 pin cpu connectors but no 4 pin. 

The 8 pin is a 4+4. You can just use half of it. Most of the time, it can even be split in half.

[RyRyJS]

1 minute ago, YoungBlade said:

The 8 pin is a 4+4. You can just use half of it. Most of the time, it can even be split in half.

Oh wow yeah I didn’t notice they can be split in half. So it’s good to have the extra 4 pin connected even when I’m not overclocking?

[dilpickle]

Just now, RyRyJS said:

Oh wow yeah I didn’t notice they can be split in half. So it’s good to have the extra 4 pin connected even when I’m not overclocking?

If you have it go ahead and plug it in. It won't be used but it won't hurt either.

[Helpful Tech Witch]

25 minutes ago, dilpickle said:

It should be fine. What mobo?

no

the 12900k pulls more than a single 8 pin can provide under a heavy load.

1 minute ago, dilpickle said:

If you have it go ahead and plug it in. It won't be used but it won't hurt either.

see above

[YoungBlade]

Just now, RyRyJS said:

Oh wow yeah I didn’t notice they can be split in half. So it’s good to have the extra 4 pin connected even when I’m not overclocking?

I would. It means that you'll be putting less strain on each of the cables as power can flow through both. Also, even at stock, the 12900K can exceed the rated max for one 8 pin cable, which is 235W.

[RyRyJS]

Just now, YoungBlade said:

I would. It means that you'll be putting less strain on each of the cables as power can flow through both. Also, even at stock, the 12900K can exceed the rated max for one 8 pin cable, which is 235W.

Thanks! Yeah I’ll plug it in to be certain.