Simple doubt about PSU 8 pin and 4 pin connector, need some help!!

[wsarahan]

Hi guys how are you?


I just bought a new CPU and a new Motherboard in a store and the store mounted it for me with my other pieces


But now i have a question, take a look at the picture:





The guy of course used the 24 pin connector and as you can see this MB has an 8 pin and one more 4 pin connector


Ho here is the question, he only used the 8 pin connector(red arrow), the 4 pin one is not plugged (blue arrow) with the PSU cable is it correct or should i plug both? If the answer is only the 8 pin why the MB have both?


I`m using here a 4770k @4.5 with a H110 2 GTX 780 in SLI and the PSU is a Coolermaster SilentPro Gold 1200W


Thanks

[profJim]

Re: Simple doubt about PSU 8 pin and 4 pin connector, need some help!!

Some motherboards have two 8-pin EPS12V (cpu) connectors to provide additional power.
With the standard 8-pin connector you can also use a 4-pin (2x2) connector plugged into only one side of the 8-pin mobo connector.
Most higher end power supplies have one 8-pin and one 4-pin power cables.
A few high end power supplies come with two 8-pin cpu connectors.
Maybe your motherboard didn't have enough available space for two 8-pin (4x2 pins) cpu power connectors.
The motherboard user manual might describe both connectors and it should be safe to use both connectors at the same time.
With your 4.5GHz overclock, a single 8-pin cpu connector should be sufficient.

[wazza300]

Re: Simple doubt about PSU 8 pin and 4 pin connector, need some help!!

as above

8 pin is enough but if you have the extra connectors on the psu then use all the 8 pin and 4 pin

[wsarahan]

Re: Simple doubt about PSU 8 pin and 4 pin connector, need some help!!

as above

8 pin is enough but if you have the extra connectors on the psu then use all the 8 pin and 4 pin

Some motherboards have two 8-pin EPS12V (cpu) connectors to provide additional power.
With the standard 8-pin connector you can also use a 4-pin (2x2) connector plugged into only one side of the 8-pin mobo connector.
Most higher end power supplies have one 8-pin and one 4-pin power cables.
A few high end power supplies come with two 8-pin cpu connectors.
Maybe your motherboard didn't have enough available space for two 8-pin (4x2 pins) cpu power connectors.
The motherboard user manual might describe both connectors and it should be safe to use both connectors at the same time.
With your 4.5GHz overclock, a single 8-pin cpu connector should be sufficient.

Yes my PSU have 2 2x4 pin connector cables so the pin at the board had the 2x4 one and now i only need to use the one part of the other 2x4 pin of the PSU to connect the over energy slot at the board right? Can i use any part of the 2x4 to this connection?

Thanks

[profJim]

Re: Simple doubt about PSU 8 pin and 4 pin connector, need some help!!

Do NOT use the second 8-pin power connector in the 4-pin slot, the unused 4-pins might cause a short circuit.
Your power supply probably has a dedicated 4-pin cpu power cable.

Check out All about the various PC power supply cables and connectors to view close up pictures of the many different connectors used in your system. Look closely at the different keyed shapes in each connector and you will see that the male and female connectors are designed to fit in only one way.







Some motherboard user manuals have excellent detailed diagrams for the various power supply cable connectors.

This is an example, but.....

This is an 8-pin video card connector and can't be used for the motherboard connection!!
The wire setup is not the same as the 8-pin EPS12V setup and will cause a short circuit if you force it.

[wsarahan]

Re: Simple doubt about PSU 8 pin and 4 pin connector, need some help!!

as above

8 pin is enough but if you have the extra connectors on the psu then use all the 8 pin and 4 pin

Some motherboards have two 8-pin EPS12V (cpu) connectors to provide additional power.
With the standard 8-pin connector you can also use a 4-pin (2x2) connector plugged into only one side of the 8-pin mobo connector.
Most higher end power supplies have one 8-pin and one 4-pin power cables.
A few high end power supplies come with two 8-pin cpu connectors.
Maybe your motherboard didn't have enough available space for two 8-pin (4x2 pins) cpu power connectors.
The motherboard user manual might describe both connectors and it should be safe to use both connectors at the same time.
With your 4.5GHz overclock, a single 8-pin cpu connector should be sufficient.

Do NOT use the second 8-pin power connector in the 4-pin slot, the unused 4-pins might cause a short circuit.
Your power supply probably has a dedicated 4-pin cpu power cable.

Check out All about the various PC power supply cables and connectors to view close up pictures of the many different connectors used in your system. Look closely at the different keyed shapes in each connector and you will see that the male and female connectors are designed to fit in only one way.







Some motherboard user manuals have excellent detailed diagrams for the various power supply cable connectors.

This is an example, but.....

This is an 8-pin video card connector and can't be used for the motherboard connection!!
The wire setup is not the same as the 8-pin EPS12V setup and will cause a short circuit if you force it.

Thanks

I was looking here at my PSU box and it says:

One 20 pin + 4 pin connector and two 4+4 pin connector, so it was used one 4+4 for the 8 pin MB connection now i just need to use half of the other 4+4 to the other MB connection right? Any half part can i use?

Thanks again

[Acebmxer]

Re: Simple doubt about PSU 8 pin and 4 pin connector, need some help!!

Thanks

I was looking here at my PSU box and it says:

One 20 pin + 4 pin connector and two 4+4 pin connector, so it was used one 4+4 for the 8 pin MB connection now i just need to use half of the other 4+4 to the other MB connection right? Any half part can i use?

Thanks again

Yes correct.

use 1 4+4pin for the 8pin connecter and use 1 half of the other 4+4pin for the 4 pin connector.

[profJim]

Re: Simple doubt about PSU 8 pin and 4 pin connector, need some help!!

Look closely at both of the 4-pin connectors on the end of the 4+4-pin power cable, their shapes are different.
Only one of the two 4-pin connectors will fit in the motherboard's 4-pin connector.
The unused 4-pin connector might accidentally short circuit against the motherboard.
Even if you wrap the unused 4-pin connector with electrical tape, heat inside your computer case might eventually cause the tape to fall off.
Your 8-pin connector supplies enough power.

[wsarahan]

Re: Simple doubt about PSU 8 pin and 4 pin connector, need some help!!

Look closely at both of the 4-pin connectors on the end of the 4+4-pin power cable, their shapes are different.
Only one of the two 4-pin connectors will fit in the motherboard's 4-pin connector.
The unused 4-pin connector might accidentally short circuit against the motherboard.
Even if you wrap the unused 4-pin connector with electrical tape, heat inside your computer case might eventually cause the tape to fall off.
Your 8-pin connector supplies enough power.

Well now i'm scared again

The 4 pin fitted easy on the MB but the other half is inside the Case in the top near the H110 radiator, i'm at the cellphone now, scare to turn on the pc with the pin connected

[profJim]

Re: Simple doubt about PSU 8 pin and 4 pin connector, need some help!!

Your system should be fine using only the one psu cable with the 8-pin cpu connection.
With your high end power supply, I don't see any real benefit to connecting the second 4-pin cpu connector unless you had a psu power cable with only one 4-pin connector. My concern is that using the second cable with only one 4-pin connection is that the unused 4-pin connector might accidentally cause a short circuit if one of the yellow 12 volt connectors somehow touches a metal portion on your motherboard or the computer case.

This is why I suggest that you don't connect the second cpu power cable to the 4-pin connector.
The 4-pin motherboard connector is very close to the rear I/O panel's metal modules, the rear heatsink shroud and a motherboard mounting screw. It's possible that the unused cable end could short circuit if it touched a chip on the surface of the motherboard. Take a close look at many of the metal connections on many of the motherboard's chips. Sorry to scare you but being overly cautious is far better than causing a short circuit.

It is very important that all unused connectors inside of your case can't cause a short circuit by making contact with any part of your case and hardware.
I use small plastic cable ties to prevent connectors from possibly causing a short circuit.

[wsarahan]

Re: Simple doubt about PSU 8 pin and 4 pin connector, need some help!!

Your system should be fine using only the one psu cable with the 8-pin cpu connection.
With your high end power supply, I don't see any real benefit to connecting the second 4-pin cpu connector unless you had a psu power cable with only one 4-pin connector. My concern is that using the second cable with only one 4-pin connection is that the unused 4-pin connector might accidentally cause a short circuit if one of the yellow 12 volt connectors somehow touches a metal portion on your motherboard or the computer case.

This is why I suggest that you don't connect the second cpu power cable to the 4-pin connector.
The 4-pin motherboard connector is very close to the rear I/O panel's metal modules, the rear heatsink shroud and a motherboard mounting screw. It's possible that the unused cable end could short circuit if it touched a chip on the surface of the motherboard. Take a close look at many of the metal connections on many of the motherboard's chips. Sorry to scare you but being overly cautious is far better than causing a short circuit.

It is very important that all unused connectors inside of your case can't cause a short circuit by making contact with any part of your case and hardware.
I use small plastic cable ties to prevent connectors from possibly causing a short circuit.

Thanks

I thought that this additional 4 pin would help me not to burn the 12v 24pin connector when using more than one graphic card installed, this happened twice with me in the past, lost 2 mobos because the SLI, so the OC_Peg sata connector is for this? To prevent the 12v 24 pin burn right? The 4 pin MB won't help on this right?


Thanks again

[profJim]

Re: Simple doubt about PSU 8 pin and 4 pin connector, need some help!!

You're welcome.
Can I come by your house on Halloween night and see if I can really scare you?

The 4-pin ATX_12V and 8-pin EPS12V connectors are primarily for providing cpu power.

AFAIK, no modern motherboard will post if you haven't connected a cpu power cable to the motherboard.
Many motherboards have an additional power cable to help deliver additional power when you have a higher end, power hungry, SLI or CrossFireX multi-gpu setup. On your motherboard, the OC_Peg sata connector is an additional power source for your video cards.
Higher end power supplies typically have thicker gauge wires that can handle more electrical current with lower electrical resistance and this helps to prevent the wires from overheating.

If you were using LN2 cooling for insanely high overclocks, the additional 4-pin cpu power connection would help.
With a high overclock using air or water cooling, it isn't needed. My 660watt power supply has an additional power cable with a single 4-pin cpu cable. If I had your motherboard, I would connect both cpu power cables, 8-pin and 4-pin.

Do a web search using computer cable management and you will pick up many excellent tips and ideas.

[wsarahan]

Re: Simple doubt about PSU 8 pin and 4 pin connector, need some help!!

You're welcome.
Can I come by your house on Halloween night and see if I can really scare you?

The 4-pin ATX_12V and 8-pin EPS12V connectors are primarily for providing cpu power.

AFAIK, no modern motherboard will post if you haven't connected a cpu power cable to the motherboard.
Many motherboards have an additional power cable to help deliver additional power when you have a higher end, power hungry, SLI or CrossFireX multi-gpu setup. On your motherboard, the OC_Peg sata connector is an additional power source for your video cards.
Higher end power supplies typically have thicker gauge wires that can handle more electrical current with lower electrical resistance and this helps to prevent the wires from overheating.

If you were using LN2 cooling for insanely high overclocks, the additional 4-pin cpu power connection would help.
With a high overclock using air or water cooling, it isn't needed. My 660watt power supply has an additional power cable with a single 4-pin cpu cable. If I had your motherboard, I would connect both cpu power cables, 8-pin and 4-pin.

Do a web search using computer cable management and you will pick up many excellent tips and ideas.

Huahuahau you won't scare me at haloween

But the main doubt now is from oc_peg, untill this board i used the evga power booster to prevent to burn again the 24 pin 12v, now i wanna know if i can remove the power booster and only use the oc_peg, this is only to prevent the pins to burn?

The power booster is a molex that you connect to any pci ex avaiable at the board and it helps inprove the energy

Oc_peg substitute this?

Thanks again

[profJim]

Re: Simple doubt about PSU 8 pin and 4 pin connector, need some help!!

It looks like the evga power booster is similar to the OC_peg sata motherboard connector where both provide an additional single +12 volt and ground wire connection for the pci-e slots. Going by pci-e specs:

• each pci-e slot provides up to 75 watts
• each gpu 6-pin connector provides up to 75 watts
• each gpu 8-pin connector provides up to 150 watts

Using the power booster or the OC_peg sata power connector provides an additional path for electrical power to the pci-e slots and this should help to slightly lower the electrical load through the 24-pin connector that powers the pci-e slots.

Would using both of these options at the same time further reduce the 24-pin electrical load? Maybe.
Is using both options safe? Probably, but I'd check with EVGA tech support to be sure.

[wsarahan]

Re: Simple doubt about PSU 8 pin and 4 pin connector, need some help!!

It looks like the evga power booster is similar to the OC_peg sata motherboard connector where both provide an additional single +12 volt and ground wire connection for the pci-e slots. Going by pci-e specs:

• each pci-e slot provides up to 75 watts
• each gpu 6-pin connector provides up to 75 watts
• each gpu 8-pin connector provides up to 150 watts

Using the power booster or the OC_peg sata power connector provides an additional path for electrical power to the pci-e slots and this should help to slightly lower the electrical load through the 24-pin connector that powers the pci-e slots.

Would using both of these options at the same time further reduce the 24-pin electrical load? Maybe.
Is using both options safe? Probably, but I'd check with EVGA tech support to be sure.

Letting the 4 pin like this is ok to not may cause a short circuit?

I connected the 4 pin at the cpu and the other 4 pin managed to the back of the case, safer right? I just don't know where it will touch when i close the back part of the case that's why i managed like that

http://imageshack.com/i/5bb213j

Maybe i can use a isolated tape to envolve the pin, helps?

And here is how it fitted inside the case, correct position i mean right?

http://imageshack.com/i/jac1b4j

Sorry for the links like this, i'm still at cellphone

Thanks