The Lattice Project
FIY They have tasks to send out BUT you have use a app_config.xml file to say how many tasks or cores to run our they will put your GPU in Waiting to run status. This happen on 3 of my rigs that have 3 GPU's installed.
On my 12 Core Rig I use the below to allow on 6 tasks to run at the same time, this leaves 3 cores open for my GPU's.
You could go as high as 8 or 9 to max out. I don't on this rig so I can also use for other tasking.
 
app_config.xml
 
<app_config>
   <app>
   <name>garli</name>
     <max_concurrent>6</max_concurrent>
   </app>
</app_config>