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




  1. #1
    wsarahan is offline Junior Member
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    Default Simple doubt about PSU 8 pin and 4 pin connector, need some help!!

    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
    My system Specs

    Gigabyte GA-Z87X-OC Force - F7 Bios

    I7 4770k @4.5

    G Skill F3-2400C10-8GTX X2

    EVGA GTX 780 SC Edition SLI - Model Number - 10DE-1004

    Corsair Force GT SCSI Disk Device (223 GB)

    Cosmos 2 Case

    Corsair H110 Cooler


    Creative SB Recon3D Audio

    Windows 7 X64

  2. #2
    profJim's Avatar
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    Default 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.
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
    .


  3. #3
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    Default 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
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  4. #4
    wsarahan is offline Junior Member
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    Default Re: Simple doubt about PSU 8 pin and 4 pin connector, need some help!!

    Quote Originally Posted by wazza300 View Post
    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
    Quote Originally Posted by profJim View Post
    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
    Last edited by wsarahan; 08-26-2013 at 08:57 PM.

  5. #5
    profJim's Avatar
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    Default 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.
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
    .


  6. #6
    wsarahan is offline Junior Member
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    Default Re: Simple doubt about PSU 8 pin and 4 pin connector, need some help!!

    Quote Originally Posted by wazza300 View Post
    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
    Quote Originally Posted by profJim View Post
    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.
    Quote Originally Posted by profJim View Post
    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
    My system Specs

    Gigabyte GA-Z87X-OC Force - F7 Bios

    I7 4770k @4.5

    G Skill F3-2400C10-8GTX X2

    EVGA GTX 780 SC Edition SLI - Model Number - 10DE-1004

    Corsair Force GT SCSI Disk Device (223 GB)

    Cosmos 2 Case

    Corsair H110 Cooler


    Creative SB Recon3D Audio

    Windows 7 X64

  7. #7
    Acebmxer's Avatar
    Acebmxer is offline Gigabyte Elite
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    Default Re: Simple doubt about PSU 8 pin and 4 pin connector, need some help!!

    Quote Originally Posted by wsarahan View Post
    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.
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  8. #8
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    Default 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.
    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
    .


  9. #9
    wsarahan is offline Junior Member
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    Default Re: Simple doubt about PSU 8 pin and 4 pin connector, need some help!!

    Quote Originally Posted by profJim View Post
    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

  10. #10
    profJim's Avatar
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    Default 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.

    Q9650 @ 4.10GHz [9x456MHz]
    P35-DS4 [rev: 2.0] ~ Bios: F14
    4x2GB OCZ Reaper PC2-8500 1094MHz @5-5-5-15
    MSI N460GTX Hawk Talon Attack (1GB) video card <---- SLI ---->
    Seasonic SS-660XP2 80 Plus Platinum psu (660w)
    WD Caviar Black WD6401AALS 640GB (data)
    Samsung 840 Pro 256GB SSD (boot)
    SLI @ 16/4 works when running HyperSLI
    Cooler Master 120XL Seidon push/pull AIO cpu water cooling
    Cooler Master HAF XB computer case (RC-902XB-KKN1)
    Asus VH242H 24" monitor [1920x1080]
    MSI N460GTX Hawk (1GB) video card
    Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium
    HT|Omega Claro plus+ sound card
    CyberPower CP1500PFCLCD UPS
    E6300 (R0) @ 3.504GHz [8x438MHz] ~~ P35-DS3L [rev: 1.0] ~ Bios: F9 ~~ 4x2GB Kingston HyperX T1 PC2-8500, 876MHz @4-4-4-10
    Seasonic X650 80+ gold psu (650w) ~~ Xigmatek Balder HDT 1283 cpu cooler ~~ Cooler Master CM 690 case (RC-690-KKN1-GP)
    Samsung 830 128GB SSD MZ-7PC128B/WW (boot) ~~ WD Caviar Black WD6401AALS 640GB (data) ~~ ZM-MFC2 fan controller
    HT|Omega Striker 7.1 sound card ~~ Asus VH242H monitor [1920x1080] ~~ Logitech Z-5500 Digital 5.1 Speakers
    win7 x64 sp1 Home Premium ~~ CyberPower CP1500PFCLCD U.P.S
    .


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