This isn't working for me with my GTX 580, whenever I add:

Code:
<app_config>
   <app>
      <name>hcc1</name>
      <max_concurrent>4</max_concurrent>
      <gpu_versions>
          <gpu_usage>.25</gpu_usage>
          <cpu_usage>1</cpu_usage>
      </gpu_versions>
   </app>
</app_config>
I get a notice about a syntax error, clicking on it takes me here http://boinc.berkeley.edu/wiki/Anonymous_platform

The project then forgets all work units in progress and won't fetch new work, even though the event log doesn't show errors.

Anyone?