I learned, that Catalyst 12.1 ist the latest version coming with OpenCL-drivers, that work with WINDOWS XP. So I went back, the GPU is now detected by BOINC (CAL: ATI GPU 0: ATI Radeon...; OpenCL: AMD/ATI GPU 0: ATI Radeon...), and jobs like "ap_21ap11ae_B6_P1_00272_20130515_20093.wu_1 (opencl_ati_100)" are frequently sent, but all these jobs terminate after a few seconds, leaving "Berechnungsfehler" (calculation error) in the status-row of BOINC-Manager. Is there anything I can do, or should I forget to use my GPU with BOINC?

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I don't think you GPU is capable of running the app. You'd need to run the hybrid app from Lunatics.

IIRC it has something to do with your memory bandwidth.

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In a rich man's house there is no place to spit but his face.
Diogenes Of Sinope

The problem is:
max WG size: 128
Max work group size: 128
http://setiathome.berkeley.edu/result.php?resultid=3000894386
(You can't fix this - it is in hardware)

SETI OpenCL apps need WG size: 256

(The thread title is not correct, e.g. Radeon HD 48xx can run these apps)

Uncheck 'Use ATI GPU' here:
http://setiathome.berkeley.edu/prefs.php?subset=project

You can try to use this GPU for other projects (but I don't know on which project it will work)

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- ALF - "Find out what you don't do well ..... then don't do it!" :)
 

milkyway wont work either... most projects will reject the card if it isn't able to do double precision.

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In a rich man's house there is no place to spit but his face.
Diogenes Of Sinope

Thanks to BilBg´s and all the other comments. I stopped to try using this GPU.

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