Not only unsupported, Mobility Radeons are further crippled by their drivers. Laptop distributors (HP, Dell, Lenovo, etc) limit the clocks on the bundled video cards and restrict access to the GPU BIOS. There are a number of logical reasons behind this, namely warranty overheating issues.
There are a number of ways to work around these restrictions, the best likely being a BIOS mod, as it would allow fluent clock changing through ATT, or other programs. However, some GPUs have their BIOS read and write protected, making the process rather futile.
Another, simpler, method is using a specific driver version. 8.9 and 8.10 Catalysts allow you to overclock when used in conjunction with AMD GPU Clock Tool.
So before we begin, these are the ingredients you want:
Vista / XP Install
|XP32/64, Vista32/64 or DNA XP/Vista||Official drivers 32/64|
|AMD GPU Clock Tool||AMD GPU Clock Tool|
|.NET Framework x86 x64||Driver Signature Enforcement Overrider|
|*Driver Sweeper||*Driver Sweeper|
|*Ati Tray Tools||*Ati Tray Tools|
To begin, uninstall your current drivers. If you have the Catalyst bundle installed, go to control panel</em>, remove programs, ATI uninstall – remove CCC, Install manager, and Display Driver, reboot.
If you are running Windows 7, load up DSEO and enable Testing Mode, reboot computer.
If you do not have an ATI entry to uninstall in remove programs then head over to device manager (Run “devmgmt.msc”), select your display adapter, right click on it and select uninstall. Your screen will probably flash.
At this point you have the option of booting into safe mode, by pressing f8 repeatedly in between bios loading screen and the windows logo, and running Driver Sweeper to wipe all traces of ATI from your computer.
When this is done boot back to windows and extract the 8.10 drivers you just downloaded. Now run Mobility Modder, point it to the ATI directory that was created, and click Modify.
For Windows 7, there is an extra step. Skip this if you are not running Win7.
Locate atikmdag.sy_ in the ATI folder, use
DSEO to sign the file.
Now go back to device manager by running devmgmt.msc , select your display adapter, and press Update Driver. Navigate to Browse fo r File, Pick from list of drivers, select Have Disk, navigate to the ATI directory which was created *ATIPackagesDriversDisplayLH6A_INF and press OK.
You may be prompted whether you wish to install an unsigned driver, press yes. If you have Windows 7, you have one more step. Use DSEO to s ign the “atikmdag.sys” in your /windows/system32/drivers folder. Now you can reboot.
When windows boots back up, you can use the AMD GPU Clock Tool to change your clocks.
When installing ATT, make sure to check Disable Overclocking, as it will not function properly. Read these notes if installing ATT on Windows 7.