I apologize in advance for starting a new thread, but I was unable to post this to the existing "Different projects for 2 opus" thread.

I have two MacPro 3,1 (Early 2008) computers with two GPUs each (from NVIDIA and ATI). They are running OS X 10.11 and Boinc 7.6 and 7.8. I wanted to crunch Collatz tasks using the NVIDIA GPU and Rosetta, Seti, and Einstein tasks using the ATI GPU. The cc_config.xml file below allows me to do so. This configuration allows tasks to be queued independently for each GPU; in other words, when the first GPU finishes a task, it does not need to wait for the second GPU to finish its task before it (the first GPU) starts a new task. Happy crunching!

<cc_config>
<options>
<exclude_gpu>
<url>http://einstein.phys.uwm.edu/</url>
<type>NVIDIA</type>
</exclude_gpu>
<exclude_gpu>
<url>http://boinc.bakerlab.org/rosetta/</url>
<type>NVIDIA</type>
</exclude_gpu>
<exclude_gpu>
<url>http://setiathome.berkeley.edu</url>
<type>NVIDIA</type>
</exclude_gpu>
<exclude_gpu>
<url>https://boinc.thesonntags.com/collatz/</url>
<type>ATI</type>
</exclude_gpu>
</options>
</cc_config>

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Now I am having a different problem. When running only Collatz, on an 8-core MacPro with 87.5% of the cores (7 cores) allocated to BOINC, frequently BOINC runs 7 CPU tasks and 1 GPU task. How do I force it to run on both GPUs (NVIDIA GTC 750Ti).

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What are your cache settings and what are Collatz deadlines? If BOINC thinks CPU tasks might miss deadline it will first fill CPUs with those tasks and then fill GPUs if there are enough free CPUs to support them. BOINC overcommits CPUs up to one CPU to run GPU tasks.