Depends completely on what you want to do, and whether the application scales more than 4 threads.
So rendering, measured with something like CineBench 10 shows +50% improvement in rendering times.
But games show little or even negative improvement, they show little improvement going from 2 to 4 or 4 to 6 cores so 12/24 isn't going to make any difference
But as a server or distributed computing or scientific computing machine, thats where multi cpus and especially the SR-2 because it can be overclocked to improve results even more