Hello. I had a problem and I want to share how I solved it.

The problem
On my system (Linux mangan 4.2.0-1-amd64 #1 SMP Debian 4.2.6-1 (2015-11-10) x86_64 GNU/Linux) (nVidia GeForce 840M Driver Version: 340.96)
The cuda libraries for cuda70 are not available (65 and 60 are). Boinc kept sending me cuda70 WUs, which crashed after 3 seconds. I have got like 90 cuda70 wus and only 5 cuda60 ones. I think boinc figured out that cuda70 tasks are fastest on my machine.

The solution
Naviate to boinc directory /var/lib/boinc-client/projects/moowrap.net/ and SwitchUser to boinc user if you run boinc-client as boinc.
Now MoVe/rename dnetc520-linux-amd64-cuda70 binary away and LiNk dnetc520-linux-amd64-cuda60 as dnetc520-linux-amd64-cuda70. Here are the commands I used:

sudo -u boinc bash

(the forum removes newlines from code blocks, srsly?)

cd /var/lib/boinc-client/projects/moowrap.net/

mv dnetc520-linux-amd64-cuda70 dnetc520-linux-amd64-cuda70-orig

ln dnetc520-linux-amd64-cuda60 dnetc520-linux-amd64-cuda70

My first taskhttp://moowrap.net/result.php?resultid=41297620 is going to finish and I will post if it gets validated or not.

The real solution will of course be checkboxes in the project preference, like Einstein or PrimeGrid has already.[/code]

NOPE, that hack did not work. Boinc decided to overwrite my link due to checksum error. So I finally read the Anonumous version articla about app_info.xml and it seems to work. Boinc refuse to download files specified in app_info, so I have to download and chmod them manually.

Anyway, here is the app_info.xml
http://brod.holes.sk/up/moowrap_app_info.xml

<app_info>
<app>
    <name>dnetc</name>
    <user_friendly_name>Distributed.net Client BR+</user_friendly_name>
    <non_cpu_intensive>0</non_cpu_intensive>
    <fraction_done_exact>0</fraction_done_exact>
</app>
<file_info>
    <name>dnetc_wrapper_1.4_x86_64-pc-linux-gnu__cuda</name>
    <executable/>
</file_info>
<file_info>
    <name>dnetc520-linux-amd64-cuda60</name>
    <executable/>
</file_info>
<file_info>
    <name>dnetc-gpu-1.3.ini</name>
</file_info>
<file_info>
    <name>job-lin64-cuda60-520.1.xml</name>
</file_info>
<app_version>
    <app_name>dnetc</app_name>
    <version_num>104</version_num>
    <api_version>7.5.0</api_version>
    <file_ref>
      <file_name>dnetc_wrapper_1.4_x86_64-pc-linux-gnu__cuda</file_name>
      <main_program/>
    </file_ref>
    <file_ref>
      <file_name>dnetc520-linux-amd64-cuda60</file_name>
      <copy_file/>
    </file_ref>
    <file_ref>
      <file_name>dnetc-gpu-1.3.ini</file_name>
      <open_name>dnetc.ini</open_name>
      <copy_file/>
    </file_ref>
    <file_ref>
      <file_name>job-lin64-cuda60-520.1.xml</file_name>
      <open_name>job.xml</open_name>
      <copy_file/>
    </file_ref>
    <is_wrapper/>
    <plan_class>cuda60</plan_class>
    <avg_ncpus>0.200000</avg_ncpus>
    <max_ncpus>0.200000</max_ncpus>
    <flops>114433597115.420319</flops>
    <coproc>
        <type>NVIDIA</type>
        <count>1.000000</count>
    </coproc>
    <gpu_ram>33554432.000000</gpu_ram>
</app_version>
</app_info>

You need the following files in the project directory, do not forget to chmod +x executables (bold).

• http://moowrap.net/download/dnetc_wrapper_1.4_x86_64-pc-linux-gnu__cuda
  
• http://moowrap.net/download/dnetc520-linux-amd64-cuda60
  
• http://moowrap.net/download/dnetc-gpu-1.3.ini
  
• http://moowrap.net/download/job-lin64-cuda60-520.1.xml
  

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