This will tell you what version your Mac has.
This tells you that 1.1 is the minimum for CC/CC2014
This is an ongoing problem, you can read more here:
All utilities are showing that OpenCL 1.2 is active on this computer with both cards, except when in PS CC or CC2014. I have been told this is a driver issue, but the latest driver is installed. And, the Adobe GPU page still shows that the ATI7950/5870 are compatible with CC/CC2014... they aren't.
At this point I can't rely upon the information that I can find online, so I'm looking for somebody that is running a similar Mac Pro 5,1 / 10.8.5 and has a GPU that can run OpenCL within PS CC/CC2014.
Ok. Looking at the thread you linked, the takeaway I got was that the Apple drivers do not yet support OpenCL in a way that Adobe is satisfied with, which explains the grayout. I don't own these machines,but was hoping to give you something to go on.
So hopefully some ATI7950/5870 owners will be by to compare notes with you.
Both cards also pass the OpenCL benchmark app LuxMark, and they work with OpenCL under CS6. I haven't heard of any other apps that don't work with these cards, only PS CC/CC2014.
Is it possible that nobody with a MacPro 5,1 is running OpenCL within PS CC/CC2014?