Acer Aspire Timeline AS5810TZ-4274 comes with these spec: Operating System Windows Vista Home Premium Memory Size 3GB DDR3 Hard Disk 320GB Graphics Card Intel GMA 4500MHD Video Memory Shared memory Dimensions 14.9" x 10.2" x 0.97" - 1.16" Weight 5.3 lbs. Video Port 1 x VGA Card

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 Aspire AS5251-1805 comes with these spec: Dimensions: 15 x 10 x 1.3 inches ; (LxWxH) Weight: 2.6 kilograms / 5.7 pounds Color: Black Display: 15.6-inch HD Widescreen CineCrystal LCD Display (16:9 aspect ratio) Processor: 2.2 GHz AMD V Series processor V120 with 512KB L2 Cache Graphic

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 Aspire Timeline AS3810T comes with these spec: Operating System Genuine Windows Vista(R) Home Premium Genuine Windows Vista(R) Home Basic Processor & Chipset Intel(R) Centrino(R) 2 mobile processor technology, featuring Intel(R) Core™2 Duo processor with 3 MB L2 cache, supporting Intel(R) 64 architecture or Intel(R) Centrino(R) mobile