This is just a quick write up on the voltage mod I did to my A7V133 since a few people asked how I did it. I don't have a digital camera currently so I don't have any pictures to show, but its pretty easy and simple. Any of the newer A7V or A7V133 have a problem with the old mod where you cant go below about 2.2Vcore which is too high for me, so I came up with this new mod. This will work on ANY A7V or A7V133.
All you need is a resistor, a soldering iron, and some shrink tubing, these can be gotten from Radio Shack for about $10-15 for all 3. The smaller the tip on the soldering iron the better of course.
What we are doing is tricking the Voltage Regulator, we make it think its supplying a lower voltage then it really is by grounding out the voltage feedback pin on the chip. Now I used a 33K resistor which makes 1.6Vcore = about 1.95Vcore. If you want LESS of a voltage increase you can use a higher value resistor or if you want MORE of a voltage increase you can use a lower value Resistor. I wouldn't recommend using any Resistor under about 22K. Now I have heard any voltage mod makes setting the Vcore through the BIOS very wacky, so I recommend using the jumpers on the board instead. Here are 2 pics to show you what pins on the chip to solder the resistor to..
All you need to do is connect the resistor between these 2 pins, to make the job easier I attached a wire onto each end of the resistor then shrink wrapped it so the wires were not bare. I then soldered the wires to the chip and superglued the wires onto the top of the chip so that they didnt move around and come lose. I also super glued the resistor to the top of the parallel port block since it is nice and flat, not near any components, and is close by.
I HIGHLY recommend you set your CPU BELOW default and set the Vcore to about 1.4 or 1.5 and then check the BIOS to see what the REAL Vcore is! Then you can proceed up to a higher Vcore! DO NOT I repeat DO NOT leave your Vcore at 1.85 or you will likely FRY your CPU because you will boot up at about 2.4Vcore!!!!! I take NO responsibility if you fry your CPU or board doing this mod!
Hopefully I can get a hold of a digi cam to take some pics and show you how I did this. If you have any questions just email me at remage@mindspring.com and I will answer any question you have.
