How do I install Civ V

I have a quad core powerpc system, 20GB of RAM, and a 7970. How do I install Civ V on my PowerPC linux?

Ummm.... How you install any other game. Unless civ 5 doesn't work or Linux 

20 gb if ram, that's an odd amount of ram, never heard of some one having taht much because it would be to little for hardcore rendering and to much for light renduring and gaming.

I have 8 RAM slots.

Since this is a dual CPU, the RAM in top slot 1 must be same as bottom slot 1, and same for all other slots.

1--------------------2GB

2--------------------2GB

3--------------------2GB

4--------------------4GB

 

4--------------------4GB

3--------------------2GB

2--------------------2GB

1--------------------2GB

 

Anyways, since this is not x86, I have no way to install games, and am required to use an AMD system. Is there any way to get steam to work.