Voltmod 7800GS [Core G71] up to core 700MHz

Discussion in 'Videocards - NVIDIA GeForce' started by PAIIITET, Oct 12, 2006.

  1. cowie

    cowie Ancient Guru

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    sure it does for me anyway
     
  2. PAIIITET

    PAIIITET Member

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    GPU:
    AGP 7800GS 375@620Mhz 1.3V
    Method is founded on VID table from Datasheet ISL6568

    By default VID AMD HAMMER
    Code:
    
    V4 V3 V2 V1 V0 
    1  0  0  1  0 = 1.1v
    
    Сonnect V4 to Ground 
    
    0  0  0  1  0 = 1.5v
     
  3. bernek

    bernek Ancient Guru

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    take a look at my pics pls :)

    Yes I took a quick look to the datasheet of the current regulator.

    If I have the same ISL then modification can be made just I have to look again at the voltage table in the pdf.

    I have 1.4 default Voltage for G70 :)

    0 0 1 1 0 for 1.4 default

    vid2 to ground will give me 1.5 ????

    0 0 0 1 0 for 1.5 ?
     
    Last edited: Oct 13, 2006
  4. PAIIITET

    PAIIITET Member

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    bernek
    Please measure resistance
    [​IMG]
     

  5. bernek

    bernek Ancient Guru

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    will measure right away :) only a second !

    is it posible to be ZERO ???? or maybe my multimeter is wrong ...
     
    Last edited: Oct 13, 2006
  6. Ajoobajabajeeba

    Ajoobajabajeeba Master Guru

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    Lets see some benches !
     
  7. PAIIITET

    PAIIITET Member

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    3DMark05
    Athlon XP 2500Mhz + 700\780 > 8300
     
  8. bernek

    bernek Ancient Guru

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    I have + 1.48 volts there ???? no resistance ???

    but it's a rezistor and it shows 0 zero and the current it 1.48 volts

    btw my multimeter is wrong ... i think it's damaged it can't measure resitance ...

    is that suppose to be the overcurent protection ? that rezistor ???

    I believe it needs to be removed ...
     
    Last edited: Oct 13, 2006
  9. PAIIITET

    PAIIITET Member

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    bernek
    Please measure resistance

    VID4 vs Ground ?
    VID3 vs Ground ?
    VID2 vs Ground ?
    VID1 vs Ground ?

    [​IMG]
     
  10. PAIIITET

    PAIIITET Member

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    GPU:
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    [​IMG]
    Must be 5Kohm or 50Kohm

    Beside me on G71 = 5Kohm

    on G70 - ?
     

  11. bernek

    bernek Ancient Guru

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    vid1:0
    vid2:12 k
    vid3:0
    vid4:0

    this means ? 1.35 volts ? from the ISL

    P.S. I hate this multimeter ... belongs to my dad and I think it a piece of crap ... but only vid2 shows resitance ... that means 1.35 from the ISL
     
  12. PAIIITET

    PAIIITET Member

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    Want to hear results beside other owner 7800GS [Core G71]?
     
  13. bernek

    bernek Ancient Guru

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    I HAVE ANOTHER MULTIMETER ! I'll go find it ! damn this is cool !
     
  14. PAIIITET

    PAIIITET Member

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    bernek

    Excuse me, this method works only on 7800GS [Core G71] 256Mb!
    I much it is difficult to speak in english

    use vr-zone guide for G70
     
  15. bernek

    bernek Ancient Guru

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    that method doesn't work ... and it involves in removing a rezistor that overcurent protection ... and soldering potentiometers to the board and a lot of things ...

    I believed that the ISL is the same and I can change vid2 to set the current at 1.5 ...

    Thank you very much for trying to help me out ... seems I'm lost with this G70 ...

    For a moment this seemed very real to me and that gaved me a nice feeling !

    Now I know that I'm stuck on google again ... and vr mods I don't think they are good ...

    THANK YOU AGAIN ANYWAY ! :) you are a very nice man !
     
    Last edited: Oct 13, 2006

  16. bernek

    bernek Ancient Guru

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    removing the resitor you asked me to measure will free me from the overcurrent protection ...

    and grounding vid2 will give me 1.55 volts ....

    I do not know if this G70 core will handle 1.55 volts ...
     
  17. jimmor

    jimmor Ancient Guru

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    On my 7800gs (G70 based), resistance measurements at your VID points are meaningless.

    However, running in windows, VID1 and VID3 measure 1.2v, and VID2 and VID4 measure 0.2v.

    EDIT:

    And according to ISL6568 datasheet, the above logic would give 1.3v ---> which in my card is correct, since 2D core volts is 1.3v.

    Setting my card to 3D makes VID1 and VID2 at 1.2v, and VID3 and VID4 at 0.2v ----> which according to datasheet logic would give 1.4v ---> which of course is my cards 3D core volts.

    So permanently grounding VID2 would change the bios selected choices from 1.3v and 1.4v to 1.3v and 1.5v !
     
    Last edited: Oct 13, 2006
  18. jimmor

    jimmor Ancient Guru

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    On my XFX 7800gs ee (G70 based), a resistance of 5K was measured accross your indicated points.
     
  19. jimmor

    jimmor Ancient Guru

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    According to my tests, grounding VID2 would achieve 1.5v !


    EDIT:

    Grounded VID2 and 3D core volts now becomes 1.5v.

    However, the card's built-in overcurrent protection limits max "under load" overclock to around 560 !
     
    Last edited: Oct 13, 2006
  20. bernek

    bernek Ancient Guru

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    WELL THIS IS THE DEAL :D but the resitor marked from him need to be penciled or lowered to allow more voltage :D

    Did you test the VGPU with VID2 to ground ??? it measures 1.5 ???? on G70
     

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