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  1. #1
    ROG Guru: Blue Belt Array twisted1's Avatar
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    Voltmodding 8800GTX

    Firstly you need one 8800GTX, ref. card.


    I've delidded my cards, it drops the temps quite a bit.


    For VRM/VRAM cooling I just used a hacksaw and adjusted the stock cold plate so the waterblock would fit.




    I'm using watercools VGA blocks, they're great when you run SLI(I have another one that I will be modding too)


    The black wire from the 500ohm trim pot. that connects to the primaron controller.


    Overview, the cables that connect to the molex are, from the left to the right Vgpu, Vmem, Ground.


    And a pic of it ready for take off. The VRM's get hotter when you give it 1.45V So a fan is probably a good idea.




    I don't have to much results to show off, but absolute max before was 702Mhz gpu, now it'll do 730Mhz after that I'm hitting OCP. Got the SMD's needed for removing OCP though will get to that soon.

    Another issue I had was the massive Vdroop, I could set it to 1.4V and under load running 3dm06, it would drop to 1330mV. And the voltages where just very unstable. I think I need to add some caps or something like that, I have 2 dead 8800GTX that I can take components from.

    Anyone got any experience with cap mods? Will the caps from my dead cards be fine or should I use something else?
    Last edited by twisted1; 09-22-2014 at 11:04 AM.

  2. #2
    ROG Guru: Blue Belt Array twisted1's Avatar
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    Turns out that the so needed OCP mod will take care of the vdroop also. Those little smd's that you solder on the card for the OCP mod, they are sooooo tiny. Wish me luck

  3. #3
    ROG 師傅 Array Arne Saknussemm PC Specs
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    Quote Originally Posted by twisted1 View Post
    Will the caps from my dead cards be fine or should I use something else?
    I have this cap?

    Attachment 41412



    Good luck...you nutter!!

    Love it!

  4. #4
    ROG Guru: Blue Belt Array twisted1's Avatar
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    Quote Originally Posted by Arne Saknussemm View Post
    I have this cap?

    Attachment 41412



    Good luck...you nutter!!

    Love it!
    These cards can go well above 800Mhz with Vmod and OCP mod, right now OCP is capping me at around 730Mhz.

    OCP mod involves soldering small SMD's on top of existing ones. Just to give you an idea of how small these smd's are. Here's one laying on top of a mem chip on a 8800GTX. It's that small thing with 122 on it :P

    Click image for larger version. 

Name:	thereal_twisted shared a photo with you on Photobucket.jpg 
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ID:	41414
    Last edited by twisted1; 09-22-2014 at 08:19 PM.

  5. #5
    ROG Guru: Gold Belt Array Menthol PC Specs
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    Glad you got SMD's, not STD's

    After you get this done, I have some 980's that need modded, my eye sight won't let me do it

  6. #6
    ROG Guru: Blue Belt Array twisted1's Avatar
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    Quote Originally Posted by Menthol View Post
    Glad you got SMD's, not STD's

    After you get this done, I have some 980's that need modded, my eye sight won't let me do it
    lol, really don't wan't STD

    Hehe, yeah I saw zombie mods for 980, sweet

    Got the SMD's soldered on there now, fingers crossed it works.

  7. #7
    ROG Guru: Gold Belt Array Menthol PC Specs
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    One thing you can count on is support from your buddies here. I wish you good results, I have an 8800 if you need one

  8. #8
    ROG Guru: Blue Belt Array twisted1's Avatar
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    Quote Originally Posted by Menthol View Post
    One thing you can count on is support from your buddies here. I wish you good results, I have an 8800 if you need one
    Thanks Menthol!

    I've got it up to 730mhz stable now, can run kombustor @790mhz but not in benches, yet.

    I got four 8800gtx, two that are alive. The others are donor cards. I got a box full of dead vga, lol

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