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...