Currently there is no software for the Mac for the new Coupled Ocean models, and Mac users are having difficulties runng sulphur models.
The requirements USED to be:
At least 350MHz G3, 600MB disk space, with 192MB ram,
but this was long ago.

Also, laptops are not a good idea for the long, intense, calcs of this projects.
They CAN be used, but it\'s up to you if you want to risk the hard disk with lots of read/writes, and you\'ll have to take precautions about sufficient cooling.