Mac
OS: 10.8.5 (Mountain Lion), 10.9.5 (Mavericks), 10.10.5 (Yosemite), 10.11.1 (El Capitan) 
Processor: Intel Core 2 Duo (Dual-Core) CPU Speed: 2.4 GHz 
Memory: 2 GB RAM 
Hard Disk Space: 8 GB 
Video Card: (ATI) Radeon HD 2600, (NVidia) Geforce 8600, (Intel) HD 4000 
Video Memory: 256MB
Multiplayer: Internet (TCP/IP) and LAN (TCP/IP) play supported. Please note, it is possible for Mac and PC to become out of sync during updates. Within this short time period, Mac users will only be able to play other Mac users. 
Notice:This game is not supported on volumes formatted as Mac OS Extended (Case Sensitive) 
Notice: The following video chipsets are not supported for Civilization V: ATI Radeon X1000 series, HD 2400, Nvidia GeForce 7000 series, 8600, 9400, Intel GMA (950/X3100), HD 3000
Notice: The Mac and Linux + SteamOS versions of Sid Meier's Civilization V are available in English, French, Italian, German and Spanish only.