Yes you can easily do this. You need to learn to use RBE bios editior.RBE - Radeon BIOS editorTech Power Up
Tutorial on how to use RBE (Radeon BIOS Editor)BAGZZlash | August 21, 2008
•Can display and change a lot of information strings inside the BIOS file, including Device ID and vendor ID.
•Accesses every PowerPlay state and can change GPU clocks, RAM clocks and voltage for each of them seperately.
•Displays the PowerPlay structure of the BIOS.
•Also displays the voltages the card can make use of.
•Can graphically display and modify four different fan controllers in a very comfortable way and automatically figures out which controller is used for a particular BIOS.
•RBE modifies the Overdrive signature of a BIOS to enable a higher overclocking limit. Signatures can also be extracted and saved to a file.
•Will make the annoying spin up bug some cards have vanish.
•Enables superior PowerPlay.
•Contains a profile editor for accessing hidden CCC panel features.
•Acquires and flashes BIOSes all from within RBE using the built-in WinFlash interface.
0 - Table of contents
1 - Introduction - What does RBE do?
2 - Acquiring the BIOS
2.1 - Using ATIFlash
2.2 - Using WinFlash
2.3 - Using GPU-Z (most recommended)
2.4 - Using RBE/WinFlash
2.5 - Using other programs
3 - Using RBE
3.1 - Opening the BIOS file
3.2 - First steps - The information tab
3.3 - Diggin' deeper - The clock settings tab
3.4 - Something relaxing - The fan settings tab
3.4.1 - The LM63
3.4.2 - Built-in fan controller
3.4.3 - A derivative of the internal controller
3.4.4 - The ADT7473
3.5 - The additional features tab
3.5.1 - Overdrive hacking - Method one
3.5.2 - Overdrive hacking - Method two
3.5.3 - BIOS update features
3.6 - The CCC profile editor
3.7 - Other things about RBE
3.8 - Saving the modified BIOS file
4 - Flashing the BIOS onto the card
4.1 - Using WinFlash
4.2 - Using ATIFlash
4.3 - Using RBE/WinFlash