Until Blender/CUDA support your card, if you are interested you could do some tests with OpenCL (kernel split or big kernel). In Maxwell cards OpenCL take about twice as long compared with CUDA (in BMW scenes), so you may be able to get an idea. But I really do not know how Pascal cards performs with OpenCL.
Anyway, if you want to try:
Open Blender with BMW27.blend scene, hit Spacebar and search: debug
(or you can also access with Ctrl+Alt+D)
Choose that option and in Debug value put: 256
Go to the Render tab, and find ‘Debug’ menu. Under OpenCL Flags, in Kernel choose: Split (If ‘Split’ does not work, you choose ‘Mega’), and in Device: GPU.
Now go to File > User Preferences > System, under Compute Devices select OpenCL, and your GPU model.
Configure big tile sizes, at least 480x270. Render and wait until kernel is compiled. Render again and share the result.
And maybe you need use Blender from buildbot (or starting from 2.78) for this test: