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Thread: ATI 3850/3870 Voltmod thread

  1. #501
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    yeah I edited my post a few minutes ago...lol. I found the pdf for the chip but I'm no expert, I want to see what the real modders say to check, I'm sure a mod is possible but I wouldn't want to give you the wrong advice.
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  2. #502
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    PanMaster take a good photo strait to the Nexsem Chip i know where the FB pin is but i cant see the card in this angle

    take a better pic from this side
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    Last edited by Vatos_locos; 02-22-2008 at 03:04 PM.
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  3. #503
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    Whats the FB? Which part needs shading in?
    Heres a quality picture taken while the card was still in the PC:

    I've found this, its an x1950 but its the same Nexsem 2415 chip
    http://img.photobucket.com/albums/v4...nexsemvmod.jpg
    Thank you for your advice
    Last edited by PanMaster; 02-22-2008 at 06:05 PM.
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  4. #504
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    the FB Pin is the Feedback it controls the Vcore on your card the pic is correct this is the Fb pin so now you have to find the resistor that is connected with the Fb pin on your 3850 for start and then i will tell you what to do

    just take a multimeter and see witch resistor measures 0Ωhms with the FB pin

    post a good pic of your card it will help us a lot

    ok try measuring those resistor and see witch one shows 0Ωhms with the FB

    if you cant put you multimeter prob on the FB pin because the are tiny you can put it on the capacitor that is connected to the FB see the trace line in the image that leaves the FB pin and goes on the tiny brown smd capacitor
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    Last edited by Vatos_locos; 02-22-2008 at 06:26 PM.
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  5. #505

  6. #506
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  7. #507
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    are you fully alright man?? i dont have cash to buy another card dude uhuauhuah

  8. #508
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    Quote Originally Posted by victorbr View Post
    are you fully alright man?? i dont have cash to buy another card dude uhuauhuah
    yep, completely sure. if you're wary, you can wait for others to confirm what i said and it won't hurt my feelings one bit.
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  9. #509
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    Have anybody got meassure and voltage point to Gigabyte HD3850 256MB ? (Red PCB)

  10. #510
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    Quote Originally Posted by Random Murderer View Post
    yep, completely sure. if you're wary, you can wait for others to confirm what i said and it won't hurt my feelings one bit.
    thx friend,i don't wanna hurt your feeling ,i am just having a bit of caution with my vga ..i don't wanna fry it

  11. #511
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    Quote Originally Posted by victorbr View Post
    thx friend,i don't wanna hurt your feeling ,i am just having a bit of caution with my vga ..i don't wanna fry it
    hey, no problem, i completely understand.
    the thing about pencil mods is that if your card blows up, erase the mod and rma it! while some may call this irresponsible or unethical, i believe that since we paid for it we should be able to rma it. the big manufacturers have money to replace it, we don't.
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  12. #512
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    Quote Originally Posted by wodnik View Post
    Have anybody got meassure and voltage point to Gigabyte HD3850 256MB ? (Red PCB)
    i believe there's someone here with that same card...
    dig through the last few pages of the thread and i think you'll find your answer.
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  13. #513
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    Can you show me vgpu measure points too?? i did the pencil mod and seems like didn't have sucess...

  14. #514
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    Quote Originally Posted by victorbr View Post
    Can you show me vgpu measure points too?? i did the pencil mod and seems like didn't have sucess...



    make sure the pencil lead took. did the resistance of R1222 drop?
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  15. #515
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    vgpu is on 1.28v?? what i have to do??
    Last edited by victorbr; 02-25-2008 at 07:36 AM.

  16. #516
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    Quote Originally Posted by victorbr View Post
    i dont know to measure resistance too..this is my first time in vmods..to measure vgpu i have to set in DCV or ACV in multimeter???..and resistance..?? thx
    for VGPU, set it to VDC or DCV. for resistance, set it to 20kΩ.
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  17. #517
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    Damn!..i shade that again and no has effect on voltage..:mad

    where can i do this new mod in my vga??

    http://img205.imageshack.us/my.php?i...870pmodsl4.png

    thx!

  18. #518
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    I used 100k ohm set to 90k ohm and my card is burned...Do I have to use 500k ohm and what is resistance for let's say 1.5v?

  19. #519
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    HAHA i am very very happy guys..pencil mod done! now i am testing..later i put my result ..THANK YOU Random Murderer you are the BEST!

  20. #520
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    You must have done the mod wrong mine 3870 can handle over 1.9v without burning and i am using 100kohms
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  21. #521
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    Please somebody show me where i have to shader for vmem pencil mod too?? thx guys

  22. #522
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    If u read the hole thread u will find it
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  23. #523
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    Hey guys..somebody knows what is that "on/ke" key on top of the HIS HD3850 512mb IceQ TurboX????thx..i have searched and didn't find anything..


    Last edited by victorbr; 02-26-2008 at 10:24 AM.

  24. #524
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    NTSC/PAL switch

  25. #525
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    Finaly I got it.
    I voltmoded my PowerColor HD3850 512 PCS and applied a "little" bump to 1.38V VCore. I changed the bios to the HIS HD3850 ICE3 (ver 071).
    I also changed the "two wire" Zerotherm by an original "3 wire" Zerothem 810.

    Now I got my HD3850@864Mhz Core and 1080 MEM. (about 30% core OC). 45° idle and 65° full load.

    With my P5B Deluxe, e6600@3.6Ghz I'm near the 12500 points in 3DMark06 (12247). I'm Happy....
    Last edited by chp; 02-26-2008 at 04:23 PM.

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