How to Volt-mod your GeForce 4 videocard


How to Volt-mod your GF4 - Part #2

Next, you will need a soldering iron with a fine tip (less than 1mm recommended) and some soldering lead. If you don’t have good soldering skills you should let a friend of yours that has good soldering skills do the soldering, or even better a firm specialized at this, for example a TV repair shop do this…


Now that you have the wire connected the tough part is over. You shall now need to solder the red wire to the middle (leg 2) on the pot, and then a wire from any of the other legs (I used leg 1) to ground in your PC, the screw connecting your card will do, however I went for a more professional look and attached it to a solder pad on the card itself…

Now if you connected the pot as I said, “sense” to leg two on pot and leg 1 to ground screwing the screw clockwise will increase the resistance, this must be done before because when the pot has been attached you will not be able to measure the resistance anymore…

This is extremely important! Make sure that you set the pot for 5k ohm, i.e. maximum resistance otherwise you will fry your card when you start your PC! Also be sure to connect the pins you measure to the card and not the other one, otherwise you will get zero resistance and you will fry the card, a good way to prevent this is to cut off the leg you will not be using.

Note: if you measured your base resistance as I described above that is what you should set the pot for instead, for my card that would be 2080ohm for v-gpu and 2480ohm for v-mem.



I connected my pots to a small circuit board; by joining the ground legs on the pots I can then use the same ground wire (I would need two otherwise.) See the pic below



Next do the exact same thing for the memory, but when you measure v-mem put the multimeter on the leg of the capacitor between the memory chips, also pictured below.




The final product is shown below; the v-gpu mod gives me an increase to 340 MHz at 1,78v. I have not gone higher since I’m just air-cooling right now but with water I expect to reach 350 - 360 MHz without much trouble.



My memory was another story however, it doesn’t seem to need more voltage than 1,6v (more current just gives more artefacts) I can reach 634,5mhz artefact free and 650 MHz if I also put a fan blowing cool air over the memory heatsinks. This is the worst memory OC I’ve seen yet, and after doing some research I’ve found out that the Gainward cards are not too friendly for extreme memory overclocking speeds, the Abit Geforce4 Ti 4200 64mb seems to be much better judging by others’ results, with most of them reaching above 700mhz speeds. Although take note that every individual card will be different and that it’s really just “luck of the draw” if you get a card that is more OC friendly or not.


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