CPU: Intel Core i5-750, 2.67 GHz | AMD Phenom II X4 965, 3.4 GHz RAM: 6 GB OS: Win 7 SP1, Win 8.1 (64-bit Operating System Required) VIDEO CARD: NVIDIA GeForce GTX 660 (2 GB Memory Minimum) | AMD Radeon HD 7950 (3 GB Memory Minimum) PIXEL SHADER: 5.0 VERTEX SHADER: 5.0 FREE DISK SPACE: 46 GB DEDICATED VIDEO RAM: 2 GB (3 GB AMD)