Right now I have an Intel i5-750 Lynnfield CPU.  I'm looking to upgrade and am trying to decide between AMD's FX-8xxx series and the various Intel CPUs.  From what I've seen, the main difference between the two is that the 8xxx series is more powerful compared to similarly priced Intel Processors when the 8 cores are efficiently used.  Since my main 3d program is Carrara, would I be better off going with AMD or Intel?