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Thread: ATI 3850/3870 Voltmod thread

  1. 02-29-2008, 12:49 PM #551
    Eldonko
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    Cleaned up the pic for other's use. Thanks guys.

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  2. 02-29-2008, 01:10 PM #552
    ceemic
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    Random Murderer, this is the best, I could take week ago:
    http://ceemic.pri.ee/hardware/hd3870/hd3870_13.jpg
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  3. 02-29-2008, 01:21 PM #553
    Random Murderer
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    your spots are the same.






    on a side note, if you want to use a different point, grab your dmm and set it to resistance. put one probe on one of those points, and use the other to touch other points and read the resistance. whenever you find a point that has 0Ω resistance, BINGO! you can use that point.
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  4. 02-29-2008, 02:03 PM #554
    ceemic
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    Yes, I already used that method
    I find 2 spots also:


    Thanks
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  5. 02-29-2008, 03:21 PM #555
    victorbr
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    Does this vmod for HIS HD3870 works with HIS HD3850???
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  6. 03-01-2008, 07:21 AM #556
    ceemic
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    Vmod done
    http://ceemic.pri.ee/hardware/hd3870/hd3870mod1.jpg
    http://ceemic.pri.ee/hardware/hd3870/hd3870mod2.jpg
    http://ceemic.pri.ee/hardware/hd3870/hd3870mod3.jpg
    http://ceemic.pri.ee/hardware/hd3870/hd3870mod4.jpg
    http://ceemic.pri.ee/hardware/hd3870/hd3870mod5.jpg

    http://ceemic.pri.ee/45nm/27667.jpg 1,61V
    http://ceemic.pri.ee/45nm/51031.jpg 1,61V
    http://ceemic.pri.ee/45nm/80731.jpg 1,64V

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  7. 03-01-2008, 07:26 AM #557
    victorbr
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    Can somebody show me where i have to pencil for vmem in HIS HD3850 IceQ TurboX???
    Last edited by victorbr; 03-01-2008 at 07:52 AM.
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  8. 03-01-2008, 07:49 AM #558
    Clint
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    Quote Originally Posted by ceemic View Post
    Vmod done
    http://ceemic.pri.ee/hardware/hd3870/hd3870mod1.jpg
    http://ceemic.pri.ee/hardware/hd3870/hd3870mod2.jpg
    http://ceemic.pri.ee/hardware/hd3870/hd3870mod3.jpg
    http://ceemic.pri.ee/hardware/hd3870/hd3870mod4.jpg
    http://ceemic.pri.ee/hardware/hd3870/hd3870mod5.jpg

    http://ceemic.pri.ee/45nm/27667.jpg 1,61V
    http://ceemic.pri.ee/45nm/51031.jpg 1,61V
    http://ceemic.pri.ee/45nm/80731.jpg 1,64V

    Volcano 12 + "open_window_mod" (outside temp +5C)
    Sweet!

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  9. 03-01-2008, 08:02 AM #559
    ceemic
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    Clint, it has been pretty "noisy" card since I bought it. Higher FPS=louder "squeeling"
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  10. 03-01-2008, 08:21 AM #560
    Random Murderer
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    Quote Originally Posted by ceemic View Post
    Vmod done
    http://ceemic.pri.ee/hardware/hd3870/hd3870mod1.jpg
    http://ceemic.pri.ee/hardware/hd3870/hd3870mod2.jpg
    http://ceemic.pri.ee/hardware/hd3870/hd3870mod3.jpg
    http://ceemic.pri.ee/hardware/hd3870/hd3870mod4.jpg
    http://ceemic.pri.ee/hardware/hd3870/hd3870mod5.jpg

    http://ceemic.pri.ee/45nm/27667.jpg 1,61V
    http://ceemic.pri.ee/45nm/51031.jpg 1,61V
    http://ceemic.pri.ee/45nm/80731.jpg 1,64V

    Volcano 12 + "open_window_mod" (outside temp +5C)
    nice work
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  11. 03-01-2008, 11:31 AM #561
    Jimbo Mahoney
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    Quote Originally Posted by Vatos_locos View Post
    Jimbo Mahoney try to shade with a pencil a bit the third resistor and see if the core can handle more Mhz if so then use a 100K Trim pot 25 turns from the FB to ground it souled work
    Thanks. Presumably, with the layout of the card, the best (only?) place to solder the pot is on the right side of that resistor, although I guess I could go hunting to find a spot with 0 ohms to the FB pin?

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  12. 03-01-2008, 11:58 AM #562
    Random Murderer
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    Quote Originally Posted by Jimbo Mahoney View Post
    Thanks. Presumably, with the layout of the card, the best (only?) place to solder the pot is on the right side of that resistor, although I guess I could go hunting to find a spot with 0 ohms to the FB pin?
    correct.
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  13. 03-02-2008, 04:23 AM #563
    zanzabar
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    for the mod here for the 3870 refrence
    http://img205.imageshack.us/my.php?i...870pmodsl4.png
    is there a better mod, and what one is better as well as what values would be good for 1.45V for gpu vcore


    also is there a pencil vdimm mod, im kinda lost and the 3870 and 3850 and reference and not in the same thread are making this hard to follow
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  14. 03-02-2008, 05:30 PM #564
    ceemic
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    Aircooling powwa: http://ceemic.pri.ee/45nm/81153.jpg
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  15. 03-03-2008, 10:00 AM #565
    Eldonko
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    Very nice ceemic, 1.8v is alot tho..
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  16. 03-03-2008, 10:15 AM #566
    Riska
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    My HD3870 with 5c cold water dident get over 60c with over 1.9v vgpu
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  17. 03-03-2008, 10:35 AM #567
    ceemic
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    Max temp@3D2006 was 30C, @3D2003 it was 28C
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  18. 03-03-2008, 11:02 AM #568
    JamesBong420
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    i need some info from some of you 3870/3850 owners....

    the location in green i need cap info and of the blue ones as well. much appreciated. thanks.


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  19. 03-03-2008, 11:08 AM #569
    Riska
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    820uF 2.5v all 4 of them.

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  20. 03-03-2008, 11:11 AM #570
    Riska
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    http://www.mouser.com/catalog/633/694.pdf

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  21. 03-03-2008, 11:19 AM #571
    JamesBong420
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    as always riska to the rescue!!! thanks allot brother..

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  22. 03-04-2008, 01:51 AM #572
    Jimbo Mahoney
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    Quote Originally Posted by Random Murderer View Post
    correct.
    Thanks. It seems to work, although I need to verify it.

    100k pot gives ~1.41 volts. Strangely, the default voltage for my 3850 seems to be 1.32v, the same as a 3870. Anyone else have this?

    I've not yet tested clocking, as I b0orked the BIOS of my mobo and am awaiting a replacement BIOS chip.

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  23. 03-05-2008, 06:07 PM #573
    slugzkea
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    Exclamation Pencil Mod in a Antec 900

    I am going to attempt the Pencil mod for both vgpu and vdimm however,
    I have the antec 900 case with all fan slots going at 120CFM.

    Will the huge air flow blow off the pencil shading?
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  24. 03-05-2008, 09:25 PM #574
    kup
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    Quote Originally Posted by slugzkea View Post
    I am going to attempt the Pencil mod for both vgpu and vdimm however,
    I have the antec 900 case with all fan slots going at 120CFM.

    Will the huge air flow blow off the pencil shading?
    It could do, but just shade it as much as you need and then stick a tiny bit of masking tape over it to protect the pencil mark.


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  25. 03-06-2008, 08:03 AM #575
    Eldonko
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    Is there OCP mod required for these cards? I did vmod and it works fine but when I raise voltage to say 1.5v I cant run 3dmark even at stock clocks. It goes black screen. 1.4ish volts works fine.

    Was cooling with chilled water and temps were below 30C so I doubt that is the issue. Any ideas? Here is the mod:

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