I have 2 GPUs, a 1080 and a 980 and when I set "day of work to 0.5, 1 or 2 days BOINC will only run just the 1080 only and will never run any work on the 980. And I still have at least 50 GPUs WUs waiting when it was set to 10 days but setting BOINC to 0.5, 1 or 2 days it will stop using the 980.

Assine GPU work.

Einstein
Moo Wrapper
All of Prime
Milkyway
Collatz

Windows 10, BOINC v7.16.20

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Software: Win 10 Pro 64 bit auto updated, Video Drivers v497.29, CUDA v11.7.1, V-Box 6.1.36
Hardware: ASUS X-99 Deluxe - i7 5930K EE 3.50Ghz to 4.00, 12 core-32GB RAM, EVGA GTX 1080Ti 11GBs, EVGA 980 GTX 4GBs, 512GB M.2 for BOINC Program and 3TB HD

Have you set

<use_all_gpus>1</use_all_gpus>

in cc_config.xml?

Does BOINC list both GPUs in the event log at startup, without saying that the second is unused?

Have you set

<use_all_gpus>1</use_all_gpus>

in cc_config.xml?

Does BOINC list both GPUs in the event log at startup, without saying that the second is unused?

It is on. I told you it was running all GPUs and only stopped if I go to anything less than 10 days of work. Setting it back to 10 days starts running all GPUs. That is very odd indeed.

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Software: Win 10 Pro 64 bit auto updated, Video Drivers v497.29, CUDA v11.7.1, V-Box 6.1.36
Hardware: ASUS X-99 Deluxe - i7 5930K EE 3.50Ghz to 4.00, 12 core-32GB RAM, EVGA GTX 1080Ti 11GBs, EVGA 980 GTX 4GBs, 512GB M.2 for BOINC Program and 3TB HD

What DOES it say in the Event Log?

What DOES it say in the Event Log?

I see nothing that's related to GPU work and why it stopped using the second GPU.

I did the test again. Right now, both GPUs are running and is set for 10 days.

I did a 1-day test and not right away, but it did stop on the second GPU.
I did a 5-day test, and it ran both GPUs for a while and then stopped on the second GPU again.
I went to 7 days, and it ran both GPUs just fine.
I went to 6-day test, and it ran both GPUs again and then stopped on the second GPU stopped again.

So, no lower than 7 days of extra work or it will just stop working on the second GPU.

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Software: Win 10 Pro 64 bit auto updated, Video Drivers v497.29, CUDA v11.7.1, V-Box 6.1.36
Hardware: ASUS X-99 Deluxe - i7 5930K EE 3.50Ghz to 4.00, 12 core-32GB RAM, EVGA GTX 1080Ti 11GBs, EVGA 980 GTX 4GBs, 512GB M.2 for BOINC Program and 3TB HD