In order for you to play Total War: ATTILA on Linux with minimal graphics settings, your computer must meet the following requirements
Operating System:
Ubuntu 14.04 LTS / SteamOS Brewmaster update 2.49
Processor (CPU):
AMD Phenom II X4 955 or Intel Core2 Quad Q9650
Memory (RAM):
4 GB RAM
Graphics Card:
Nvidia GeForce GTX 470
Network:
Broadband Internet connection
Storage:
35 GB available space
In order to play Total War: ATTILA on Linux with maximum graphics settings, you need a computer with a configuration no worse than the following
Operating System:
14.04 LTS / SteamOS Brewmaster update 2.49 or later
Processor (CPU):
AMD FX 8350 or Intel i5-3570K
Memory (RAM):
8 GB RAM
Graphics Card:
Nvidia GeForce GTX 760
Network:
Broadband Internet connection
Storage:
35 GB available space