Sony VPCZ122GX/S VAIO Z comes with these spec: Processor L3 Cache : 3MB Speed : 2.40GHz1 with Turbo Boost Technology up to 2.93GHz Type : Intel(R) Core™ i - 520M Memory Installed : 4GB (2GBx2) Type/Speed : DDR3/1066MHz Maximum : 8GB Graphics Processor : NVIDIA(R) GeForce(R) GT

Lenovo Ideapad G550 2958-9PU comes with these spec: processor Intel Pentium Dual Core T4500 processor Operating System Genuine Windows 7 Home Premium Display 15.6 inch high-definition LED backlight display, 16:9 widescreen Memory 4GB DDR3 memory Graphics Intel Graphics Media Accelerator 4500M Camera Integrated web camera High quality

Acer AS5517-1216 comes with these spec: Operating System Genuine Windows Vista(R) Home Premium Genuine Windows(R) 7 Home Premium Processor AMD Athlon™ 64 X2 Dual-Core Processor TK-42 (1MB L2 cache, 1.60GHz) or AMD Athlon™ 64 X2 Dual-Core Processor L310 (1MB L2 cache 1.20GHz) or AMD Athlon™ 64 Single-Core

Lenovo ThinkPad SL510 comes with these spec: Processors Intel(R) Core™2 Duo with 1066 MHz FSB Intel(R) Dual Core Celeron Operating Systems Genuine Windows(R)7 Professional Genuine Windows(R) XP Professional Form Factor / Dimensions 2.56kg / 5.64 lbs with 6 cell battery (32 -36) mm x 380mm x 247mm

Lenovo ThinkPad T510 comes with these spec: CPU/Chipset Intel(R) Core™ 2 Duo i5-520M i5 (2.4GHz, 3MB L3, 1066MHz FSB, 35W) Intel(R) Core™ 2 Duo i5-540M i5 POP2 (2.53GHz, 3MB L3, 1066MHz FSB, 35W) Intel(R) Core™ 2 Duo i7-620M -i7 (2.66GHz, 4MB L3, 1066MHz FSB, 35W) Operating System