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Thread: Video volt modden

  1. #1
    Join Date
    Dec 2007
    Posts
    1,727

    Video volt modden

    What is complete modden and what do you need?

    What is complete modden?
    Most overclockers know it, you come a time when the maximum frequency of your chip. When a CPU you can get into the BIOS to increase the tension as you get more space, but a video card that does not. This tutorial explains how you can complete video modden thus an even higher overclocking to achieve.

    Volt Modden is physically adjust your hardware (video card / motherboard) to a higher voltage to be set for your CPU / GPU / Memory. This higher voltage your chip further overclocking and so achieve better scores in benchmarks or to get higher FPS in games. Because the voltage is increased, the temperature of the chip also go up, you must be careful that he is not too hot.

    What do you need?
    For your video card to complete modden you have the following materials and equipment needed:
    • soldering iron;
    • tin;
    • potentiometer;
    • thin wire (with core);
    • multimeter;
    • glue gun.




    A soldering iron with a small point but very wise, because the legs you have to solder often very small and you usually can quickly cause a short circuit. The best you can be as thin wire with a solid core, this solder is a bit easier. Thread of an old floppy cable for example, work very well.

  2. #2
    Join Date
    Dec 2007
    Posts
    1,727

    Re: Video volt modden

    Volt Modden
    In this example I use a NVIDIA Geforce 9500GT as an example, but other video is about the same way.

    First, we search for the measuring the voltage of the memory (Vmem) and GPU (Vgpu). The easiest is to the ground pin of your multimeter to the ground of your diet and connect with other pen several points on your video card to try. They are often found in the coils and capacitors. On picture below you see the sites that give 1.10Vgpu and 1.82Vmem.


    Now we find chipjes regulate the voltages on the video card and often sit on the back of the card near the microphone. On these chips are codes as RT9259, ISL6522 and so on. The chips that we find are often found in nearby capacitors, black / gray blocks or coils. On my card, these are the chips I'm looking for the APW7067N and APW7065.





    A chip can you recognize a paw to the little button.

    Then find the datasheets of these chips, often something as "Synchronous Buck PWM Controller. This datasheet can be found for example in Google to search the model number of the chips, or visit the following sites:
    • Alldatasheet.com
    • datasheetcatalog.com
    • datasheetarchive.com


    If you have good data is found, it is intended that The pinout of the chip searches. In our case the APW7067N, this controls the voltage of the memory:



    If you The pinout of the chip found, you find the FB (feedback) pin on. The resistance between this pin and ground to reduce the voltage of the memory increase. By a potentiometer between the FB pin and ground soldered, we can reduce the resistance between them. First we measure the resistance between the pin and the ground. In this case the value is 0.85 K ohms. You can then use this formula calculate what pot you should use:

    Rv = (R1 * R2) / (R1 + R2)
    R1 = resistance current value
    R2 = potentiometer resistance value
    Rv = Is the resistance was changed as the potentiometer is put on.

    Rv we as close as possible to keep the value of R1 as R2 10K ohm we try we get:

    Rv = (10 * 0.85) / (0.85 +10)
    Rv = 8.5 / 10.85
    Rv = 0.78

    Rv differs more than 0.05 K ohm with the original value, this is a little too much so we even 25K ohm:

    Rv = (25 * 0.5) / (0.5 +25)
    Rv = 21.5 / 25.85
    Rv = 0.2

    This value we have calculated a much better compliance. In principle, it is a matter of trying. We can for this mod is a potentiometer of 25K ohm use. The other mod that we are about to perform is exactly the same in his work. First we look for the datasheet of the chip (APW7065), this controls the voltage of the GPU. Then we look at the pinout:



    Then we measure the value of the FB pin and ground. In this situation the value 1K ohms. Then we calculate the resistance value of the potentiometer should have, because the value close to the value from the previous example is 25K Ohms will also work in this case:

    Rv = (25 * 1) / (1 +25)
    Rv = 25/26
    Rv = 0.96

    This value is fine, so for this mod, we can also use a 25K potentiometer.

    Volt Modden

    We can now complete the two mods on the map to soldering. The potentiometer can best be attached with glue on the map. I paste on a blank piece of card a piece of tape, where I glue pot with two seconds down on board. This way you can easily remove when needed.





    Finally we need to take a wire soldered to the microphone. This measurement, we have previously been found in the tutorial. The advantage is that the values about to easier to read.


    The card is now ready so we can the "beast" on the rack to go. If it is good, both voltages slightly higher than first (because Rv still slightly lower than the original value). The value of the potentiometer to turn down the voltage even further to rise. Possibly you can now have the wires soldered with a glue gun with some glue so they are extra tight.

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