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 | Windows 7 |
| 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 |
*optional components
To begin, uninstall your current drivers. If you have the Catalyst bundle installed, go to control panel, 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 *\ATI\Packages\Drivers\Display\LH6A_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.
after doing this, my drivers works just fine but i cannot see any flash videos Youtube.com chrome or toher browsers crashes.. when someone sends my any file via skype, skype crashes when i try to open it.. and alot of apps crashes after this MOD..
can this be fixed ?
What is the version of flash you are using? Have you tried to reinstall flash after installing the drivers?
In the last few months they started releasing Flash versions which support hardware acceleration, its likely that this may cause a problem, so if after reinstalling flash you still experience the problem downgrading to flash 9.x should solve it. I’m just guessing, though, and I realize that this is probably not the answer you were looking for ;(
Hope that helps, best regards.
it’s possible to enable uac then?
UAC wasn’t mentioned here
Has anyone actually done this and it works? I have a ATI Radeon 3100, would this work for it? I’ve tried using ATI-tool and that doesn’t work. Somebody please help me out!
Read and you will see that you need to use the AMD GPU Clock tool and a specific driver version. ATITool does not work, that’s why you had no luck with it.
..:: i’m sorry if i sound a lil noobish but that’s because i’m a little tired after fixing my lappy but will this work on a X1400? thanks in advance if it does for the hard work ::..
it works with all mobility and radeons, so it should work for the x1400 too.
Im gonna buy me ATI Mobility Radeon X1600, next month
Fantastic information. I have several Lenovo z60m laptops and this got my WUXGA up and running perfectly. Follow the directions and you will be all set. I was not able to get the AMD clock tool to run but the tray tool works fine. Thanks to enthusiasts the rest of us working stiffs can actually get work done! Thank you again:)
Peter Giza
CTO – RedBlack Software
Amazing!! Thank you very much for all the hardwork, truly is appreciated.
Again thank you very much indeed!!
ok now I’m set with my mobility x600 running win7 x64. Now how do I get the Conexant audio up and going on win7 x64? hmmmm…