I am planning to buy the new Mac Pro.
But the question is:
better the single processor with 4 core and 2,93ghz or the 2 processors with 8 core and 2,26ghz? The price is pretty equivalent at the end... but which solution is best performant?
Well the gaming would benefit (if you have 2 GPUs) from the Nehalem Xeon. But the video editing might end up benefiting from the dual CPUs but not by much since Nehalem itself has hyperthreading which gives it 8 logical cores which would be equivalent to 2 CPUs.
Overall I would say go with the 2.93GHz Nehalem Xeon because it will act as 8 cores and perform on par with the dual CPU system.
Actually, both setups have a Nehalem - the choice is between a single Nehalem with 4 cores, 8 threads at 2.93, or the dual nehalems with 8 cores and 16 threads at 2.26. Honestly, the video editing and dvd creation would be faster on the dual processor setup, but the gaming would be faster with the single CPU, so chose based on which you do more.