Asus Q551LN-BBI706 15.6" 2-in-1 Notebook PC - Intel Core i7-4510U 2.0Ghz 8GB 1TB DVDRW NVIDIA 2GB GT 840M Windows 8.1(Certified Refurbished) Operating System: Genuine Windows 8.1 Processor: Intel Core i7-4510U Processor, 2.0GHz (3.1GHz turbo) Precessor Cache: 4MB L3 Cache Memory: 8GB System Memory (1666MHz DDR3) Max supported = 12GB Video Graphics: Nvidia GT840M 2GB