Apple Macbook ME874LL/A Pro 15.4-Inch Laptop (2.6GHz Intel Core i7 processor, 16GB DDR3, 512SSD) 2.6 GHz Intel Core i7 processor (Turbo Boost 2.0 up to 3.8 GHz) shares 6 MB of level 3 cache, and has an integrated memory controller (dual channel) 512 GB PCIe-based flash storage; 16GB 1600MHz DDR3L onboard memory 15.4-inch (diagonal) Retina display, 2880x1800 pixel Resolution; LED-backlit with IPS technology Dual Graphic: NVIDIA GeForce GT 750M with 2GB of GDDR5 memory and Intel Iris Pro 5200 Comes with the installed OS. Can be upgraded to the latest OS