Ok so, here is the deal. I do fairly heavy duty statistical modelling that takes ohurs/days to run depdening on what I am doing and for that I need raw processing power. I don't care about GPU particularly. Current machine bought in 2012 a late 2011 MBP 15: quad core i7 16GB and Samsung SSD. A good machine for sure, but I'm thinking of selling it for 4 reasons a) it still has resale value and 1 year applecare b) I can get student discount on new mac only for next 2 months or so c) I'm finding it slow on the longer models and its breaking my work flow d) minor point but the loud fans didn't use to bother me, but having seen how quite the new ones are they now really annoy me. Anyhow - what I'm wondering is - should I buy a new 15" max spec MBP which has about a 40% improved geekbench score, and much faster SSD, or should I custom build a windows box for raw power (can build a hex core, 32GB RAM for about a third the cost of the new max spec MBP that would be faster) and buy a cheaper lower spec laptop along side it for on the road purposes ? Extra considerations: I occasionally do need to take this computer out of the office even if I do have a second laptop - maybe once a month - hence why I bought a laptop in the first place. May even spend some months in another country in the coming year and would need to bring it with me. This would point to new mbp. Right now I am in two minds between these options. Seeking wisdom. Edit: re software - I have to run some windows programs occasionally and is the most demanding work. I run parallels for minor stuff, but when need all the power boot current machine direct to windows.