Those who would like to join forces with the Sectoid would need at least Windows 7 64-bit, an Intel Core 2 Duo E4700 2.6 GHz or AMD Phenom 9950 Quad Core 2.6 GHz processor, 4GB of RAM, either a 1GB ATI Radeon HD 5770 or 1GB NVIDIA GeForce GTX 460 or better, DirectX 11, 45GB of available space, and a DirectX compatible sound card.
For the Mechtoids, you will need a machine that has at least Windows 7 64-bit running on it, a quad-core 3GHz processor, 8GB of RAM, either a 2GB ATI Radeon HD 7970 or 2GB NVIDIA GeForce GTX 770 or better, 45GB of available space, and a DirectX compatible sound card. Either way, one will require an internet connection for the Steam authentication process.