minimal:
reqprocessor: Intel Core i5 2.7 GHz (or equivalent AMD)
reqgraphics: NVIDIA Geforce 460 / AMD 5850 with 2GB VRAM
reqmemory: 4 GB RAM
reqdiskspace: 10 GB available space
reqsystem: 64-bit Ubuntu 12.04 or 14.04 or Steam OS
reqother: Due to OpenGL 4, Intel video cards no longer supported

recommended:
reqprocessor: Intel Core i7 2.5 Ghz (or equivalent AMD)
reqgraphics: NVIDIA Geforce 680 / AMD 7870 with 2GB VRAM+
reqmemory: 8 GB RAM
reqdiskspace: 10 GB available space
reqsystem: 64-bit Ubuntu 12.04 or 14.04 or Steam OS
reqother: Due to OpenGL 4, Intel video cards no longer supported