Not appropriate for the new Mac Pro because the Nehalem Quad XEONs which are currently used are faster than these hex cores.
There is a reference value for a 12 core AMD machine in the new CineBench version and it is slower than my 2.26GHz octad Pro.
The AMD machine is a 2.62 GHZ dual AMD Opteron 2435, so more clock speed, more cores, but still slower.