Hello. I'd like to allow specific GPU(GPU in AMD 7950x), not 3080, to compute.
Is there any settings? Or mb task filter with tasks for AMD GPUs?

With Notepad, make a file called cc_config.xml in your BOINC Data directory (if it not already exists) and add into it:

<cc_config>
<log_flags>
</log_flags>
<options>
<<ignore_cuda_dev>1</ignore_cuda_dev>
</options>
</cc_config>

Save it as cc_config.xml, making sure it doesn't get an added .txt (which Windows likes to do), and make sure it's set to UTF-8 encoding.
After that, exit BOINC completely and restart it.

The system has 1 AMD GPU and 1 NVIDIA GPU, so shouldn't it be
<ignore_nvidia_dev>0</ignore_nvidia_dev>

According to the manual (https://boinc.berkeley.edu/wiki/Client_configuration) it should be <ignore_nvidia_dev> instead of <ignore_cuda_dev>.
The latter is deprecated but still works according to the source code.

Please remove the typo at the beginning of line 5.
'<<ignore...' should be ''<ignore...''.

Well, I can't remove typo's anymore than you can. But you're right, it should've been nvidia instead of cuda.

<cc_config>
<log_flags>
</log_flags>
<options>
<ignore_nvidia_dev>1</ignore_nvidia_dev>
</options>
</cc_config> 

It appears to be good config.
Some tasks ended with computation error :)[/img]

Next day - NVIDIA computations is running...
cc_config.xml:
<cc_config>
<log_flags>
</log_flags>
<options>
<<ignore_cuda_dev>1</ignore_cuda_dev>
</options>
</cc_config>

https://fastpic.org/view/126/2025/1214/04d0a863871fb5a62c19a8c1f6bbfd5c.png.html

<cc_config>
<log_flags>
</log_flags>
<options>
<ignore_nvidia_dev>1</ignore_nvidia_dev>
</options>
</cc_config>

Updated info on config.
Still running nvidia

In reply to Vitalii's message of 14 Dec 2025:

Updated info on config.
Still running nvidia

>> After that, exit BOINC completely and restart it.

GPU detection and decisions are made at BOINC client startup. So also make sure that when you exit BOINC Manager, that you select to stop running apps and exit. As it's very much possible to only stop BOINC Manager (the GUI) but continue to run the client. It's the client that needs to be restarted for this to stick.

And double check that cc_config.xml doesn't have an added (but invisible) .txt extension, as Windows likes to hide extensions on everything.

In reply to Vitalii's message of 14 Dec 2025:

<cc_config>
<log_flags>
</log_flags>
<options>
<ignore_nvidia_dev>1</ignore_nvidia_dev>
</options>
</cc_config>

Updated info on config.
Still running nvidia

The BOINC manual page linked in my previous post states this:
"<ignore_nvidia_dev>N</ignore_nvidia_dev>
Ignore (don't use) a specific NVIDIA GPU. You can ignore more than one. Replaces <ignore_cuda_dev/>. Requires a client restart.
Example: <ignore_nvidia_dev>0</ignore_nvidia_dev> will ignore the first NVIDIA GPU in the system."

So, as long as you only have 1 NVIDIA GPU replace your
<ignore_nvidia_dev>1</ignore_nvidia_dev> with
<ignore_nvidia_dev>0</ignore_nvidia_dev>.

And don't forget to restart the BOINC client.

I most def must brush up on my older knowledge of options and logs. Thanks for the second pat on my fingers.