...is not fast, is not fluid (i.e. realtime), but it is possible
The only reason I'm posting this is that I've seen some threads about this topic, and wanted to share my experiences.
Now I was making some tests with this "diamond watch" thingy made by a (virtual) friend of mine called Antoine aka "à la mouche" and for the first time I tried PathTracing with 16MaxDepth, a studio HRDI (octane_studio9) and a 364k tris model... I expected Octane would crash but...
well, it took about 2 hours to reach 2800+ samples/px (and I learned to do my material tweaks while pausing the render process) but if you consider I'm forced to use an on-board 9400m with 256Mb shared, and I had another CPU unbiased renderer running and a Linux VBox virtual machine (with another 1024Mb shared) open... is not that bad
of course I'm not saying I can render complex scenes, high-res films, huge textures and the like
of course I look forward to the new beta, and new nVidia driver for OSX
and of course the render itself needs huge work, but that was not the point here...