Power supply 12V_2 cable question

[Nick Stafford]

Specs:

Power Supply: Corsair RM850x

Motherboard: Asus Prime X399-A

CPU: Threadripper 2950x

GPU: EVGA GeForce GTX 1080  

 

 

My question concerns connecting the power supply to the motherboard optimally. This is my first build. I have not tested any components yet. I would like to set this up so that I can add additional GPU's in the future. Attached are images of relevant sockets and manual pages.

 

The motherboard has 3 power connectors:

• 24 pin: EATXPWR
• 8 pin: EATX12V_1
• 4 pin: EATX12V_2

The corsair cables do split from 8 pin to 4 pin. I plugged them in, but 4 of the pins are not connected anywhere.

 

My Questions:

1. Should I connect to all three ports like I did? Are they all needed.
2. If so, is it OK for the extra 4 pin connector to dangle like that?
3. Does it matter where on the power supply I connect these?

Thank you very much for your time.

 

 

[5x5]

It's fine..don't worry. You did it correctly.

[mariushm]

Leave it hanging, as long as nothing touches the contacts inside the connector you're good. If you want, move that loose connector behind the 24pin atx connector, or use a zip tie to hold that loose connector away from the board.

 

Technically, if you don't overclock the system, the 8 pin EPS connector would be enough to power your CPU. In very heavy benchmarks, the 2950x goes to 250w and in a "torture test" with PBO (some auto overclocking stuff) it got to 320 watts.

The 8 pin EPS connector is good for around 380 watts.

 

It's just better for your piece of mind to have the 4 pin connector as well, reduces the strain on the 8pin connector.

 

It won't really matter where the other end goes into the psu, as long as those are labeled with CPU

 

Use the supplied torque screwdriver to install your cpu and screw until the torque screwdriver makes that click ... it's very important for threadripper to be properly inserted in socket. If it's not right, you could have problems with motherboard not detecting ram in some memory slots, or you may get memory errors.

[Nick Stafford]

Thank you very much. You guys are great. Is there a way to close this thread to indicate that the problem is solved?

[Jurrunio]

21 minutes ago, Nick Stafford said:

Should I connect to all three ports like I did? Are they all needed.

Yes. the 24pin powers the board, the 8 and 4pin powers the CPU. Technically you could run without the 4pin but why not use it when you have the cable for it.

 

23 minutes ago, Nick Stafford said:

If so, is it OK for the extra 4 pin connector to dangle like that?

yes, this is its intended use.

 

23 minutes ago, Nick Stafford said:

Does it matter where on the power supply I connect these?

not really, it fits it's good.

[Jurrunio]

Just now, Nick Stafford said:

Is there a way to close this thread to indicate that the problem is solved?

there's a tick on the bottom left of each reply that only the original poster can mark as the solution and solve the thread.