Steam account required for game activation and installation This content requires the base game Stellaris on Steam in order to play The Multiplayer feature for this content requires a Paradox Account in order to play PC System Requirements MINIMUM: OS: Windows 7 x86 or newer Processor: AMD Athlon II X4 640 @ 3.0 Ghz / or Intel Core 2 Quad 9400 @ 2.66 Ghz Memory: 2 GB RAM Graphics: AMD HD 5770 / or Nvidia GTX 460, with 1024MB VRAM. Latest available WHQL drivers from both manufacturers. Storage: 4 GB available space Sound Card: Direct X 9.0c- compatible sound card Additional Notes: Controller support: 3-button mouse, keyboard and speakers. Special multiplayer requirements: Internet Connection or LAN for multiplayer. Mac System Requirements MINIMUM SPECS: OS: OS X 10.8.5 or newer Processor: Intel Core i5 @ 2.5Ghz Memory: 4 GB RAM Graphics: ATI Radeon HD 6750 / NVIDIA GeForce 320 or higher with 1024MB VRAM Storage: 4 GB available space Additional Notes: Controller support: 3-button mouse, keyboard and speakers. Special multiplayer requirements: Internet Connection or LAN for multiplayer. Linux System Requirements MINIMUM SPECS: OS: Ubuntu 14.04 x86 Processor: AMD Athlon II X4 640 @ 3.0 Ghz / or Intel Core 2 Quad 9400 @ 2.66 Ghz Memory: 2 GB RAM Graphics: AMD HD 5770 / or Nvidia GTX 460, with 1024MB VRAM. Latest available proprietary drivers from both manufacturers. Storage: 4 GB available space Additional Notes: Controller support: 3-button mouse, keyboard and speakers. Special multiplayer requirements: Internet Connection or LAN for multiplayer.