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Aopen Vcore volt mod done.
Some of the Aopen P4 motherboards suffer from a flaw that doesn't allow user selected voltages in BIOS above around 1.55V to work. So after much sweat the mod is done to give more volts than that.
Oh, so you want to know how it's done eh? OK....
On the Aopen AX4GE TUBE - G motherboard the chip to mod is the FAN5093 chip inside the CPU retention cage area.
It has 5 VID pins on it that set the Vcore. It defaults to 1.475V, but my board under volts that to 1.42V.
Trying to solder the pins on this chip is asking for trouble as they are very small and thin and easy to get all soldered together (I know because I'd previously soldered a POT onto pin 24, and got it all intimate with pin 23! The POT didn't work BTW because this is a digital chip not analogue....thanks Tim for the pointer.)
However there just happens to be some handy VID solder points nearby that are much easier to solder to.
Simply work out your default voltage required and ground the appropiate VID pin.
Connecting VID3 to earth gives 1.675V default (1.475V now equals 1.675V)
Connecting VID2 and VID3 to earth gives 1.775V default (1.475V now equals 1.775V)
My board under volts remember so 1.675V is an actual 1.63V in hardware monitoring. I can now move between 1.62V and 1.71V using the BIOS
Here's the wire in place for 1.675V default. Or if you don't want to do any soldering then you could probably use conductive paint to make the connection to a nearby ground point (yellow line on the pic).
I take no responsibility for nuked boards obviously. It should work on any of the AX4G series AFAIK but you'll need to check you have the correct chip and connection points.
MM
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but well done on managing to acheive what you'd set out to do and without blowing anything up 
Originally Posted by Knoxville
