This App will only work on GPUs that are Compute Capability 5.0 or higher.
See list of supported GPUs here, https://en.wikipedia.org/wiki/CUDA#GPUs_supported

Best Drivers;
El Capitan 10.11.6 zi3v http://www.nvidia.com/object/macosx-cuda-8.0.71-driver.html
It is Not recommended to use CUDA driver 8.0.81 or above as it’s much slower than 8.0.71
This zi3v App will Not work in Yosemite, and zi3v cuda90 is recommended for Sierra and above.

Yosemite 10.10.5 zi3t2b http://www.nvidia.com/object/macosx-cuda-7.5.30-driver.html
The zi3t2b App should work with 10.10.5, and up to 10.11.6. It is not recommended for Sierra.

The Only settings needed for the CUDA zi3t2b App is the -bs setting for reduced CPU use and -unroll N setting in the app_info.xml cmdline section. Unroll Autotune and -bs is built-in for zi3v.
If you wish to use 100% CPU per task, use the cmdline setting -nobs for zi3v, or for zi3t2b remove the cmdline -bs.
<cmdline>-nobs</cmdline>
<cmdline></cmdline>

Restrictions for vRam, Do Not Exceed the numbers below for GPUs with;
1 GB vRam use -unroll 2 or Less
2 GB vRam use -unroll 6 or Less, you may use -unroll 8 depending on your monitor setup.
<cmdline>-unroll 6</cmdline>
If you have 3 GB or more vRam, you can use the Autotune settings which will set the number to equal the GPU multiProcs, -unroll autotune
Run One task at a time unless you have over 4 GB of vRam, even then One task will probably be best.

Finish your existing GPU tasks, then place the expanded files in the /Library/Application Support/BOINC Data/projects/setiathome.berkeley.edu folder.
If you are running Yosemite you will need to swap out the App & app_info.xml to the ones for Yosemite.
If you are not familiar with changing owners with the Terminal, just reinstall BOINC to set the correct owners/permissions.
