-Step Up From - MC375LL/A-Step Up Feature - 500GB Hard Drive -2.66GHz Intel Core 2 Duo Processor; 4GB 1066MHzDDR3 SDRAM - 2x2GB Memory; 500GB Serial ATA D
-Step Up From - MC372LL/A-Step Up Feature- 7200 rpm HDD, Hi-Res ANTIGLARE LED Display2.53GHz Intel Core i5 Processor; 4GB Memory; 500GB Serial ATA Drive @