basic question - DirectX vs. DirectX 9 option?

[khaldrogo]

Is there a significant difference? Thanks in advance for any responses.

 

[anandus]

Have a look here: http://forums.civfanatics.com/showthread.php?t=381048

 

[warpstorm]

Trying them both DX11 used less RAM than the DX9 version for me.