This will help to increase the memory voltage for Abit AN7.

This is a guide to voltage modding your Abit AN7 memory voltage. Although it
gives 3.2v maximum, some may crave more.

Look for the resistor R316 as shown below.

Unsolder the resistor. Replace it with a 800 to 1K ohms resistor. It can be
an SMD resistor, a normal resistor or a variable resistor. Increasing the resistance
increases the voltage, so 0 ohms means no increase. Take note that it will only
go as high as the 3.3v rail. To get high voltage, you will need to mod your
3.3v rail as well.

For voltage mod guide, you can refer to