OSX best GPU

Im about to upgrade ready for 12, currently running 2 x GTX 780Ti in an expansion chassis and a GTX 680 for GUI.

I have enough Linux hell in my life with Flame to NOT want a Red Hat Resolve as I use so many client supplied codecs I use the Resolve to straighten everything out into DPX for online.

So my question, Im thinking of replacing all three GPUs with either TitanZ or GTX 780 Ti. Obviously the price differential between the Titan Z and GTX 780 Ti is huge (US1500 v US750 so I'm asking if the performance benefits under OSX make the extra expense worthwhile. Has anyone got a link to some benchmarks?

I doubt the 12 GB vs 6 GB will have any impact but the almost doubling of cuda cores must make a huge difference right?

Mike

GPU heavy Tasks with the Titan in my system are over twice as fast at the 6GB 780 it replaced, the 980Ti is probably better value though, you could get a pair of those instead.