To put it simply, you need to solder a 50K OHm VR to a ground, and to pin 7 of the HIP6302 voltage regulation IC on your motherboard. You can get the 50K Ohm VR you need,
HERE.
Before you start, set the Vcore voltage as low as you can through your motherboard's BIOS. Doing this will prevent you from overvolting too much to begin with, which could damage your processor.
Step-by-step:
1. Solder a long, thin wire (single strand IDE cable wiring works really well) to one of the outside legs of your 50K Ohm variable resistor.
2. Solder another long, thin wire to the center leg of your 50K Ohm Variable resistor.
3. Break off the third, unused, outside leg on your 50K Ohm Variable resistor.
4. Set your 50K Ohm VR to 50K Ohms of resistance, check it using a multimeter, measuring resistance across the two wires which you have soldered onto the VR.
5. Solder the wire on the
outside leg of your 50K Ohm VR to pin #7 of the HIP6302 IC. Pin 7 is shown in the link that you posted, but I have attached a picture for you.
6. Solder the wire on the
middle leg of your 50K Ohm VR to a ground. Easy grounds to use include Pin #9 of the HIP6302 IC, or any unused 3-pin motherboard fan port ground.
7. Fire up your machine. Slowly lower the resistance of your 50K Ohm VR in order to increase the Vcore overvolt. Turn the VR slowly with 1/4 turns, and moniter the Vcore overvolt through the motherboard BIOS as you adjust the VR.
Thats all there really is to it
. Optional, but highly reccomended, is a jumper soldered inline with the ground wire, to make the voltmod removeable.
If you are a little sketchy about soldering on your motherboard, spend some time and practice soldering leads onto a dead piece of hardware before you operate on your board.
Good luck.