Acer Aspire AS7551-2531 comes with these spec: Processor AMD Athlon II Dual-Core Processor P320 Operating System Windows 7 Home Premium Display 17.3″ HD+ Widescreen CineCrystal LCD Display Chipset AMD M880G Chipset Memory 4096MB DDR3 1066MHz Memory Graphics ATI Radeon HD 4250 Graphics with 256MB of Dedicated System

Acer AS5542 comes with these spec: Operating System Genuine Windows(R) 7 Home Premium Processor AMD Athlon™ X2 Dual-Core Processor M300 (1MB L2 cache, 2.0GHz) Chipset AMD™ M880G Memory 4GB (2GB installed in each of two memory slots) DDR2 667 SDRAM Storage 320GB* hard disk drive Integrated variable-speed

Acer AS5542-5547 comes with these spec: Operating System Genuine Windows(R) 7 Home Premium Processor Intel(R) Core™2 Duo Processor SU9400 (3MB L2 cache, 1.40GHz, 800MHz FSB) or Intel(R) Core™2 Duo Processor SU7300 (3MB L2 cache, 1.30 GHz, 800MHz FSB) or Intel(R) Pentium(R) Processor SU4100 (2MB L2 cache, 1.30GHz,

Acer AS5542-5206 comes with these spec: Operating System Genuine Windows(R) 7 Home Premium Processor AMD Athlon™ X2 Dual-Core Processor M300 (1MB L2 cache, 2.0GHz) Chipset AMD™ M880G Memory 4GB (2GB installed in each of two memory slots) DDR2 667 SDRAM Interface Ports DC-in RJ-11 modem RJ-45 LAN

Acer AS5740-5144 comes with these spec: Operating System Genuine Windows(R) 7 Home Premium Processor & Chipset Intel(R) Core i5-520M processor (3 MB L3 cache, 2.40 GHz, up to 2.93 GHz, DDR3 1066 MHz, 35 W), supporting Intel(R) 64 architecture, Intel(R) Smart Cache, Intel(R) Turbo Boost Technology Mobile