I'm trying to render on a Tesla K80, but it doesn't work.
Ignoring device Tesla K80, not officially supported yet
Release notes of 2.77 say:
Add support of GK210 GPUs (NVidia Tesla K80). (ff0dcc5)
But I had to use a custom build of Blender (very recent), so I'm not sure if the problem is of the custom build or if Teslas aren't supported at all yet. Couldn't try further cause my shift ended.
Any information on the current state of "Tesla & Cycles" I will mark as correct answer.
EDIT I've search in the Blender source for the string "Ignoring device Tesla ..." and I think I found it in opencl_util.cpp although I'm not 100% sure. If that's true it would mean that Blender uses OpenCL instead of CUDA. Not sure why it would, CUDA drivers and toolkit where succesfully installed (confirmed) on the target machine. Any insight on how to force CUDA instead of OpenCL?
EDIT2: It doesn't work either with official Blender builds. Same problem. Now some linux specialists had a look at the issue but couldn't figure it out yet.