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.

NVIDIA is still computing...
Is computer reboot OK as BOINC client disconnect-connect?
https://fastpic.org/view/126/2025/1215/_45befccd6c203e9f785a9af03cc4712a.png.html

Please post your BOINC startup messages after a fresh restart. The first 30 lines or so should suffice.

Do also know that you can disable the Nvidia GPU in your Primegrid (and other projects) preferences.
https://www.primegrid.com/prefs.php?subset=project
Edit preferences
Uncheck Use NVIDIA GPU
Update preferences (way way at the bottom)
That way, this project won't even send work for the Nivida GPU.

If you want to disable the Nvidia GPU in other projects, you do this at their project preferences.

Why not exclude_gpu. jord you've recommended it before

https://boinc.n-helix.com/forum_thread.php?id=7486

cc_config options
https://boinc.mundayweb.com/wiki/index.php?title=Client_configuration

Template:

<exclude_gpu>
<url>project_URL</url>
<device_num>N</device_num>
<type>ATI | NVIDIA | intel_gpu</type>
<app>appname</app>
</exclude_gpu>

Found reason:
BOINC logs shows there is no cc_config.xml... But this file in same folder...
https://new.fastpic.org/album/Ou1qvz5RjV

P.S. Updated BOINC. It is an option install as service. It mean disable any GPU computation. It is final resort.
P.P.S. Checked and unchecked a lot of check boxes at Primegrid online config.

It's in the wrong folder.
It should be in BOINC Data folder (by default it's C:\ProgramData\BOINC - and it's hidden)

---

BOINC maintainer.
For any insight, check my BOINC Development Blog.

TY. Now it running as expected :)