Radeon HD 4850 Voltmods

Introduction

This voltmod applies to all HD 4850 series cards using PCB #B50131-00.

The HD 4850 supports very limited voltage control via BIOS or software, only up to 1.20V

Disclaimer:
Performing these voltmods will void any and all warranties your video card may have.
You - and only you - are responsible for any damage caused indirectly (or directly) by these modifications.

Overview

GPU Voltage Mod (soldering)

GPU Voltage Mod (pencil)

You have to do only one of those mods, depending on the voltage you want to achieve.


This first voltage mod is easy to do but will not give you much more than about 1.4V on VDDC.


If you need more than 1.4V you should do above voltmod. Please note that you have to paint on the PCB between the two solder dots. Since this is more difficult we recommend the first pencil mod for smaller voltage increases.

Memory Voltage Mod (soldering)

Memory Voltage Mod (pencil)

Source: http://www.techpowerup.com/articles/overclocking/voltmods/151