From my google fu I leanred that SSS has been implemented on GPU for Cycles since 2.72 in the experimental kernel. I'm on 2.78b and I'm just getting a black shader like when it doesn't work. I installed 2.78c, and it's still not working. Any guesses as to what setting may be borking me here? Any ideas where I should focus my troubleshooting?
Blender 2.78c OS: Windows 10 64bit GPU: AMD Radeon R9 390 CPU: Intel i5-6500 3.2 GHz
P.S. I can't create an SSS tag for this post till I have 300 reputation. If anyone else agrees with me that SSS would be a good tag and has 300 reputation, feel free to tag it :)