Well, I finally got my new Mac Pro this week (2.66, 4 gig). Only problems I had are the usual right click issues with the wireless mighty mouse and some incompatible dl media with the super drive (and i'm awaiting my new lcd, but it's still plenty usable with my 17" crt). So, there had some discussion about how well software could use the multicore systems (and therefore, how useful, moving to 8-core mac pros might be). Unlike a lot of you out there, I don't do any video or graphics work with my mac pro (nor do i do much gaming), so off the bat, the stock 7300 was all I really needed). I mainly do statistical analysis (other than the usual web surfing, e-mail, listening to music while i work, etc.) and use STATA. Recently, they upped their offerings to true multi-processor versions for os x (only intels). Pricing is by the number of processors you want to support, and I could only really justify the 2-processor version as a 4-processor version (under edu pricing) is $800 more than the 2-processor version ($1495 vs. $695). And as it is, the numbers for stata show that the efficiency gain you get with increased number of processors decreases with each extra processor. So, I did a couple of tests with some code that I had been using previously that would kill my iBook (1.42GHz G4) and would still take a while on the university mainframes. Anyway, STATA actually did chop it up into 3 threads (maybe 1 is just the housekeeping for the program and the gui, etc.?) and ran the code quite smoothly without bogging down the system, making my life a lot happier . It does demonstrate that with this type of workflow, you really are limited to the number of processors that the program license will work with (and the non-mainframe versions of stata will not allow you to run multiple instances simultaneously). cheers.