can someone explain what this means to the average user? (If you're going to come say if i don't know what it means then don't worry about it then don't bother, i like educating myself.) Ive been googling and so far all i have come up with is that it has to do with the CPU and the RAM, maybe its more efficient? Not sure, and is leopard 64 bit or 32? If its 32 then can it handle 64 bit applications since GCD is a part of all macs now?