I think if a 2.5ghz macbook pro can run it a 3.06ghz could run it, although I recommend getting a pro line mac for CS4 im not sure what other people think, also whatever machine you get max out the ram, it will be way better, also get a external hard drive so the .psd and other stuff wont clam your hard drive, I recommend lacie, the drives are seagate so theyll be great.