I have two CUDA enabled GPUs on my machine. However, BOINC doesn't want to use the second one.

NVIDIA GPU 0: GeForce GTX 260 (driver version 19038, CUDA Version 2030, compute capability 1.3, 896MB, 537 GFLOPS peak)
NVIDIA GPU 1 (not used): GeForce 8300 (driver version 19038, CUDA Version 2030, compute capability 1.1, 256MB, 24 GFLOPS peak)

I know, the second GPU is slightly less powerfull than the first one, but it's still able to compute data.. Is there a way to make BOINC use the second GPU too?

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Check your BOINC data directory for a file named cc_config.xml. The path to the data directory is listed in the Messages tab of BOINC manager after a reboot. The directory may be hidden by windows and it contains the file client_state.xml (and many others).

If you don't have a cc_config.xml, create one using notepad (Editor) and paste

<cc_config>
	<options>
		<use_all_gpus>1</use_all_gpus>
	</options>
</cc_config>

into it. When saving, make sure that no other suffix (.txt) is appended to the filename.

If you already have created a cc_config.xml file, add the <use_all_gpus> line to the <options> section.

After that, select "Read config file" from the Advanced menu or, better yet, restart BOINC.

Gruß,
Gundolf
[edit]See also the Nvidia CUDA & ATI Stream (CAL) FAQ at the BOINC FAQ Service.[/edit]

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