Lenovo ThinkPad T450s 20BX001FUS, 512GB SSD, 8GB RAM, 14-Inch Laptop (Black) Intel i7-5600U (2C, 2.6 / 3.2GHz, 4MB, 1600MHz) Processor 512 GB Solid-State Drive; 8 GB DDR3L SDRAM 14-Inch Full HD (1920x1080) IPS Screen, Intel HD Graphics 5500 Intel 7265 AC + BT 4.0, Backlit Keyboard, Fingerprint Reader Windows 7 Professional 64-bit preinstalled through downgrade rights in Windows 8.1 Pro 64-bit. Maximum expandable Ram memory: 20 GB