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Thread: P4C800-E DLX CPU voltage drop, can someone help?

  1. #1
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    P4C800-E DLX CPU voltage drop, can someone help?

    Hi,
    I run my P4 at 225fsb on a regular basis at 1.65 volts on my P4C800-E DLX and when the cpu is loaded, I have a major drop of 0.10 - 0.13 volts. I know this is a problem with this Asus board but is there a mod I can do to fix this problem?
    Some pictures and detailed instructions would help me alot.

    Thank you
    Last edited by jfl; 01-18-2004 at 06:35 AM.
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  2. #2
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    its called the droop mod. do a search

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    Heres a link to the thread . I have just done the mod to my P4C800E deluxe mobo and it workks great. A 50k vr set to 35 k is required for the mod. The part you have to solder to is very small so you will need a good soldering iron to do it . With my mobo set to 1.575 volts and according to asus probe it reads 1.625 at idle and never goes below 1.616 volts under load. it used to go down to 1.532 volts before the mod.The mod worked well.

    http://www.xtremesystems.org/forums/...threadid=25891


    Hope this is of some help.
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    Thank you very much!
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    Skyline, can you make a macro foto of the mod, please?

  6. #6
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    does anyone know if increasing resistance helps stabilize the voltage? we're at 28k Ohms, and 1.63Vcore is 1.875 in bios.. and fluctuates from 1.61V to 1.69V
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    Thanks for the pic. I should solder the pot to that brown capacitor? Am I right?

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    macci told me much easier way to do droop on P4C800 mobo.

    Solder vr between those blue dots. I almost *cked up my mobo, when I used to thick wire and condensator almost fell off , so it was alot easier to solder on those dots.


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    Just a thought but wouldnt taking a pencil to it be real easy?
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  10. #10
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    Originally posted by wolfgang
    Just a thought but wouldnt taking a pencil to it be real easy?
    what are you nuts??

    processor and motherboard are at stake there

    and i dont think a pencil would work well
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    [QUOTE]Originally posted by The Stilt
    macci told me much easier way to do droop on P4C800 mobo.

    Solder vr between those blue dots. I almost *cked up my mobo, when I used to thick wire and condensator almost fell off , so it was alot easier to solder on those dots.

    [/QUOTE



    so u have solder a vr down to those dots and it worked
    which one u put as ground and which hot]

  12. #12
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    Originally posted by johon
    so u have solder a vr down to those dots and it worked
    which one u put as ground and which hot] [/B]
    Yup. Think that "Hot" is spot closer that small A.

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    Yup. Think that "Hot" is spot closer that small A.
    Can you confirm that!? Because I'll probably aplly this vmod to my board tomorrow and it was very important to know if it is the right way!
    Btw... I will use a Mach II to this board with the droop mod, will I be able to have some type of problem due to this mod with the Mach II?

    Thanks in advance...
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  14. #14
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    It doesnt really matter which one is "hot", like it didnt matter in orginal mod (soldering on capasitor). Youll just need to generate resistance between those spots, so it doenst matter which is ground or the "hot" one.

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    I already did the droop mod, but seems that something is wrong, when I put 1.525, the BIOS indicates 1.632 +/-, and I can't have a 1.75 vcore for example, because when I put 1.75, the BIOS indicates 1.9 +/-!
    Anybody knows the right value to a 100k pot to obtain the better stability in the vcore?

    Thanks in advance!

  16. #16
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    Just increase the value of that vr. Set ex. 1.75V in bios, boot, go in bios hw monitor and ajust vr until voltage is set to right level.

  17. #17
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    There's no value that I can set to the vr. that give me a vcore of 1.75 for example!

    Option BIOS -------- Reading BIOS
    ---- 1.525v -------- 1.632v
    ---- 1.600v -------- 1.690v
    ---- 1.625v -------- 1.850v

    Something isn't right in this droop mod...

    When I measure the vr. in the mobo, the max. that he gives me with a multi is about 45k, and I used a 100k vr., is this normal!?
    It will be better to substitute the 100k vr. for one of 50k?

    Thanks in advance!
    Last edited by TheInVisibleGod; 02-03-2004 at 10:54 AM.
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  18. #18
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    I used 50k ohm vr for this mod. When the vr is ajusted to ~38k ohms, it will give you allmost exactly the same voltage, that you set in bios.

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    Hum... weird thing, have you used the macci's mod!?
    I think I'll try a 50k vr!

  20. #20
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    Whould this mod work on a Asus P4P800 ?
    .. Updating my RIG ATM...

  21. #21
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    yes, all the mods are the same on P4C and P4P. Im doing that mod too(the macci one, it looks easy).

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    Hi !

    I did the droop mod yesterday on my P4C800-E DLX and i got to say that i'm very happy with it...
    System :
    P4 3.0 (SP-94 + PAPST)
    ASUS P4C800-E DLX
    Corsair 2*512 (PC4000)

    Before the mod everything was stable at 3.3 (15*220) but I had random freeze/reboot at higher freq...

    Now after the mod everything seems to be rock stable at 3.5 (after 4 hours of prime 95 and a few aqua/3d mark pass) moreover, as you can see on the screenshot below, i don't have anymore huge Vcore drop/jump...



    I set the Vcore to 1.7 V in the bios and when monitoring it under windows, the Vcore is 1.74 idle and 1.70 on full load (+/- 0.03 V). The VR was set to 30K.

    I used what i can call the "macci mod" (blue dots)

  23. #23
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    Quick one. Where do I messure the Vcore (yes yes yes, I know I can look at in the Bios)


    Edit: But I gotta say I love the mod. 1.536 is the lowest I've seen it on default Vcore. And 1.552 on the highest
    Last edited by Veritas.no; 02-26-2004 at 02:20 PM.

  24. #24
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    so wait, lower resistance = higher volts? Plz explain this mod to me. Thx <=me
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  25. #25
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    Originally posted by Slickthellama
    so wait, lower resistance = higher volts? Plz explain this mod to me. Thx <=me
    When you decrease resistance between ADP3180 legs 17 & 18 (blue dots or both ends of capasitor), ADP3180 chip think that Vcore is too low and increases it. When value of resistor is even more decreased, ADP3180 thinks that its still too low, and increases it some more

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