GTX 950 VMod Worklog

Discussion in 'Modding' started by newlife, May 12, 2016.

  1. newlife

    newlife Member

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    Over the past few weeks I've been volt modding a Gigabyte GTX 950 Xtreme Gaming using a vero type prototype PCB

    Some scores before I got into the modding

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    Now to begin with I did the memory mod which involves soldering a trimpot to ground on the FB pin of the PWM controller plus volt read points on the board

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    Now it came as a really big surprise just how well the Samsung GDDR5 scales with volts and this are with 1.85v

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    Next up I got LCD panel meter but the one I got has a min voltage of 8v by mistake so I put use reading the 12 volt rail on the GPU and I also added the trimpot for the GPU core and you might also notice the DVI screws I've hotglued to the trimmers as it makes them much easier to turn

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    Next I solder the trimpot to GPU cores PWM controller but with this it's soldered between the VREF and REFIN pins

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    So far still to go:
    Add 2 12v LCD panel meters for GPU core and memory voltages
    Resolder and neaten up the cables
    Add a connector so the cables can be disconnected from the board
     
  2. ginger_nuts

    ginger_nuts Member

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    Nice one mate
     
  3. hairy

    hairy Member

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    been a while since I haven anyone doing this kind of thing !
    keep up the good work !
     
  4. zeropluszero

    zeropluszero Member

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    watching with interest!
     
  5. Paulie_AU

    Paulie_AU Member

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    We need another shitty gpu modding comp.....:D. I should finish my 8800gtx mod but damn i find those really small solder points hard.
     
  6. zeropluszero

    zeropluszero Member

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    Coming to hwbot this July ;)
     
  7. newlife

    newlife Member

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    Thanks guys
    Cheers and the idea came from a old school overclocker called Massman

    The wait is killing me :lol:
     
  8. newlife

    newlife Member

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    Just because I forgot credit goes to Elmor for helping identify the mod for the core and to mllrkllr88 for the idea to use a prototype PCB

    Also the card doesn't seem to scale past about 1.35v which I was running from a bios I modded at the beginning but it may come to use if I do something like this again with sub zero ice water
     
  9. newlife

    newlife Member

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    Bit of an update as I just picked up some db9 male and female connecters and about $2 worth of wire plus a cheap 5 way crimp tool

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    And I ordered some lcd volt meter panels which should arrive next week
    http://www.ebay.com.au/itm/161865645069

    Edit: just noticed I only got charged for 1m per colour not 2m like I got
     
    Last edited: May 13, 2016
  10. ginger_nuts

    ginger_nuts Member

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    What thickness cable do you use ?
     
  11. newlife

    newlife Member

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    The cable I bought is 7.5mm (smallest jaycar had and 25c a meter and rated at 600ma) but I had been using at a guess 5mm which I salvaged from a firewire front panel cable which doesn't work with the wire striper part of the crimper as 7.5mm is the smallest it does

    Edit: My bad it's 13x0.12mm
    Edit 2: that's I think 13 strands by 0.12mm2 plus I'm shocking with wire sizes but I think that might be around 26awg
     
    Last edited: May 13, 2016
  12. newlife

    newlife Member

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    Bit more of an update as the first db9 connecter is done

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    Some heat shrink tubing on the solder points

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    Heat shrinking the whole thing apart from ground

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    P.S. Click on pictures to make them bigger
     
  13. newlife

    newlife Member

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    And another update

    All the wiring on the prototype PCB is done but I somehow knocked the gpu core mod off because of being soldered to some tiny ass resistors so that isn't wired on the gpu side but is on the pcb side

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    I'm still going resolder and shorten the lcd panel wires plus cut back the wires on gpu side and make as neat as possible

    Also I must say this turning out to be the single neatest thing I've ever done on my life
     
  14. newlife

    newlife Member

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    Neatened everything up today and put the connector to a PCI-E bracket

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  15. newlife

    newlife Member

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    I ended up killing the card when the cores mods came off as it damage a trace :upset: But will be getting a new 950 Xtreme Gaming during the week and for the time being I've connected the board to a 560 :D

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  16. newlife

    newlife Member

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    Bit of an update as the lcd panel meters arrived today and the PCB is pretty much finished apart from the LET on the bottom to prevent shorts and the panel meters only read in decivolts meaning I'm likely going to have to get different ones

    Here's the PCB connected to a gtx 560
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  17. gazza30

    gazza30 Member

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    Hey mate nice work on the mod :thumbup: shame she died but yeah it happens good luck on the next mod.

    Instead on soldering pots straight to the board have you thought of soldering a standard 3pin fan connector to the board then you can just plug in a different pot if required for different gpu's.
     
  18. newlife

    newlife Member

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    Thanks and I had been looking a way to socket them but never thought of something like a 3 pin fan connecter so I might have to give it a try
     
  19. newlife

    newlife Member

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    Ending up giving it a try but used the power plug for the windforce logo for the 950

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    Also a delay in getting a new card as I'm now looking at getting a 960 xtreme gaming as they are finally available at retail and I've wanted one since I first had about them
     
  20. newlife

    newlife Member

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    Ended up adding a 4 pin fan connector for the memory trimpot and assuming they aren't sold out I should get a 960 xtreme gaming during the week

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