I updated the files in http://boinc.thesonntags.com/collatz...download/test/collatz_4.02_windows_x86_64__cuda50.zip so that it now correctly request work. For whatever reason, when using an app_info.xml with BOINC 7.0.52, it won't request GPU work unless there is a CPU app in the app_info.xml as well -- even if the project preferences say not to use it. It also pretends to be v3.11 with plan class cuda42.

I also got the "solo" versions of the ATI OpenCL version giving correct results so I'll need to find someone with a HD7xxx GPU to test that and make sure it doesn't error out right away.