Mac Pro

Quad-Core

12-Core

Server

One 3.2GHz Quad-Core Intel Xeon
processor
Two 2.4GHz 6-Core Intel Xeon 
processors
One 3.2GHz Quad-Core Intel Xeon 
processor
6GB (three 2GB) memory 12GB (six 2GB) memory 8GB (four 2GB) memory
1TB hard drive1 1TB hard drive1 Two 1TB hard drives1
18x SuperDrive 18x SuperDrive OS X Lion Server
ATI Radeon HD 5770 with 1GB GDDR5 ATI Radeon HD 5770 with 1GB GDDR5 ATI Radeon HD 5770 with 1GB GDDR5

Desktops > Imac > Mac Mini