Performance is much better than my Buffalo 2tb Terastation Pro. I cannot imagine that the CPU plays that critical of a role in performance. I would think that HDD speed would be more important. What does the CPU have to do add up 1's and zeros and set the parity based on that. I would say that a slow 120 gig PATA drive mixed in with some SATA 300's would slow things down much more. Plus the number of hdd's has to play a factor. I think that 4 1tb drives would be faster than 8 500gig. Then again I am new to this. Would anybody in the know like to chime in? Put the following items in order of speed performace gains. CPU, HDD speed, more memory, network speed 100 vs 1000, number of hdd's in the system.