From the Collatz ATI Power app readme:
Exclusion of GPUs: x (default none)
If a certain GPU should not be used by the app, one can exclude it. The GPU number has to be in
the range 0..31. The first GPU in the system has the number 0. This option can be used multiple
times. Per default, all supported ATI GPUs are used. Do not use it with an ATI aware BOINC client!
It should be ignored in that case. But there may be some unwanted side effects.
Example:
<cmdline>x1 x2</cmdline>
The app will not use the second and the third GPU in the system.
Claggy
I'm using BOINC 6.10.58 and optimized applications from the Collatz web, I've read all the Readme.txt, and using in the
app_info.xml the factor x1, as follows:
<cmdline>x1</cmdline>
because the HD4250 is reported by BOINC as GPU 1, but nothing happens, well everything happens,
still Collatz using this GPU.