http://social.bioware.com/page/da2-patches

This will add the option to enable higher detail replacements for most textures in game. A big difference will be noticed on lev […]
Show full quote

This will add the option to enable higher detail replacements for most textures in game. A big difference will be noticed on level art especially.

Requirements:
Using high-resolution textures requires a graphics card with at least 1024MB video memory.
Most of the benefits from the Hi-resolution textures will only be seen if you are able to run the game in DirectX 11.

To manually download your new content on the PC:
Download the installer from the link below and run it.
Run Dragon Age II.
Open the Options menu.
Select Video options.
Check the "Hi-resolution textures" checkbox.
Note: In order to enable the "Very High" setting you will need a video card that supports DX11 and the latest drivers.