Sony Vaio VPC-SA4BGX/BI (Black)

Intel® Core™ i5-2450M 2.50GHz  with Intel® Turbo Boost Technology up to 3.10GHz, 3MB cache,  4GB DDR3/1333MHz RAM,  500GB Serial ATA HDD,  DVDRW +/- Double Layer,  13.3" (1600 x 900) LED

Sony Vaio VPC-SA4FGX/BI (Black)

Intel® Core™ i7-2640M 2.80GHz1 with Intel® Turbo Boost Technology up to 3.50GHz, 4MB cache,  8GB DDR3/1333MHz RAM,  500GB Serial ATA HDD,  DVDRW +/- Double Layer,  13.3" (1600 x 900) LED