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Thread: Note for those running heavy oc'ed Quadfire 4890

  1. #1
    Moderator LardArse's Avatar
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    Note for those running heavy oc'ed Quadfire 4890

    Whem making the Classified I did take precaution to increase trace thickness for the 4 PCIE slots for the 3 groups of power. As before when overclocking quad fire 3870 I found they eat a lot through pcie slots.

    This way the trace does not burn up, or restrain cards oc in quad fire.
    However as there are only 2 +12v yellow wires, the connectors thus get hot at the 24pin ATX.

    I myself have melted the 24 pin ATX connector when running 4 x 4890 oc. I dunno why these cards draw so much from slots, the nvidia cards dont seem to

    Anyways if you are one of those quad fire guys this may help you.






    This should fix you up.
    Last edited by LardArse; 06-11-2009 at 11:10 PM.

  2. #2
    Xtreme Enthusiast Kabauterman's Avatar
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    Was that the reason why Kevins Board burned?

  3. #3
    Moderator LardArse's Avatar
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    Yes, the 2 yellow wires of the 24pin only power the slots and just one or tow low current linear power regs

  4. #4
    Xtreme Legend dinos22's Avatar
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    nice one
    kev could have used that advice heh
    his 24pin burnt just as you describe
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  5. #5
    Wanna look under my kilt? K404's Avatar
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    Thanks for the idea Peter

    I knew that with PCI-E2.0 power distriution and Q-SLI/ CF-X, that kind of current draw would distress boards eventually.
    Quote Originally Posted by T_M View Post
    Not sure i totally follow anything you said, but regardless of that you helped me come up with a very good idea....
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    you sigged that?

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  6. #6
    Xtreme Addict dpa's Avatar
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    blah, I really dont want to solder on my board....

    working as a charm at 1000Mhz * 4 and 1.45 * 4..

  7. #7
    Diablo 3! Who's Excited? [XC] gomeler's Avatar
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    Thanks for the heads up Shamino, would hate to burn out my $400 beauty

  8. #8
    Xtreme Member Patch's Avatar
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    Pardon my inexperience, but I'm gonna give this a go and have 2 questions:

    1) That is a regular molex connection you're soldering on there, correct?

    2) Do you need to remove the 2 yellow 12V wires from your PSU 24 pin ATX connector when doing this? Or plug it in as is and have both the 24 pin and your mod supplying power to the trace?

  9. #9
    Moderator LardArse's Avatar
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    no just solder , yes molex connectors, dont do nothing to the origianl Power supply, but other than 24pin plug in the molex of your psu too.

  10. #10
    Xtreme Member Patch's Avatar
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    Thank you.

  11. #11
    Xtreme Member carpo93's Avatar
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    this mod can work on other mobos?
    sorry for my bad english
    Gigabyte Battlefield Pi 1M #3

  12. #12
    Moderator LardArse's Avatar
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    Quote Originally Posted by carpo93 View Post
    this mod can work on other mobos?
    yes though i dont know how thick the trace for +12v to pcies on other boards are so its best to solder behind the slots themselves.

  13. #13
    Xtreme Member carpo93's Avatar
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    tried on m4a79-t deluxe, but the mobo seem died

    i think there is a sort of protection
    sorry for my bad english
    Gigabyte Battlefield Pi 1M #3

  14. #14
    take me to the manbar Vivi's Avatar
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    the dangers of modding :?

  15. #15
    k|ngp|n/Sham my brothers hipro5's Avatar
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    Quote Originally Posted by carpo93 View Post
    tried on m4a79-t deluxe, but the mobo seem died

    i think there is a sort of protection
    You must have done something wrong then...
    The 24 pin connector is UNIVERSAL for ALL platforms and it uses the EXACT SAME PINOUTS....
    INTEL PWA FOR EVER

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  16. #16
    Xtreme Member carpo93's Avatar
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    Quote Originally Posted by hipro5 View Post
    You must have done something wrong then...
    The 24 pin connector is UNIVERSAL for ALL platforms and it uses the EXACT SAME PINOUTS....
    you can be right

    but i think the mobo has an overload protection, so istantly swich off
    sorry for my bad english
    Gigabyte Battlefield Pi 1M #3

  17. #17
    Moderator LardArse's Avatar
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    Quote Originally Posted by carpo93 View Post
    you can be right

    but i think the mobo has an overload protection, so istantly swich off
    its your psu, some psu diffrent +12v rails connect together it protects, find the same +12v rail as the atx (by using continuity check on the yellow pin and of the atx) or a different psu
    Last edited by LardArse; 07-13-2009 at 08:15 AM.

  18. #18
    Xtreme Member carpo93's Avatar
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    ok but the mobo now is death

    i tried with other psu, but it gave me a black screen and all the fan on
    sorry for my bad english
    Gigabyte Battlefield Pi 1M #3

  19. #19
    Moderator LardArse's Avatar
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    uhmm, did your ATX connector on your MB happen to face the other direction for the locking clip?

  20. #20
    Xtreme Member carpo93's Avatar
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    yes, but i do the rigth mod for my direction
    sorry for my bad english
    Gigabyte Battlefield Pi 1M #3

  21. #21
    ¿ G H Z's Avatar
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    Quote Originally Posted by LardArse View Post
    I myself have melted the 24 pin ATX connector when running 4 x 4890 oc.
    Were the cards on air?

  22. #22
    Xtreme Member carpo93's Avatar
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    someone has the pci-e electric scheme?
    sorry for my bad english
    Gigabyte Battlefield Pi 1M #3

  23. #23
    Moderator LardArse's Avatar
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    only air man


  24. #24
    Admin runmc's Avatar
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    Lardy -

    Would this mod be of any benefit if you were only using 2-3 4890?
    UNDER THE ICE .com
    Phase Change Cooling

    is the remedy

  25. #25
    Xtreme Member carpo93's Avatar
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    Quote Originally Posted by LardArse View Post
    only air man

    thx

    i'll do my own mod
    sorry for my bad english
    Gigabyte Battlefield Pi 1M #3

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