This post , http://setiathome.berkeley.edu/forum_thread.php?id=68948&sort_style=6&start=0 , said (last year) that there were "new AstroPulse Windows applications for ATI/AMD Graphics Processing Units that support the OpenCL language".
I have made an honest effort of searching for news of a linux (32 or 64)
Astropulse app for ATI/AMD GPU.
Could you, please, let me know if such things exist (and just not available at the moment)
They don't exist yet and there is [is not] a plan to make some.
I understand that WU coding is an extensive effort.
And if you can't wait, try the Lunatics optimized applications. These run under the anonymous platform, so any newer update from Seti will pass by your computer. You'll then have to update such applications yourself.
Ancient Astronaut Theorists suggest that in many ways, you can be considered an alien conspiracy!