ubuntu 11.10 Installing ATI Driver FGLRX

My laptop, Dell 1555, comes with the graphic card ATI 4570. After having the fresh install of ubuntu 10.11, it pop out an installation for additional Drivers, which are asking me to install the driver for my graphic card. There are 2 available options:

• ATI/AMD proprietary FGLRX graphics driver (post-release updates)
• ATI/AMD proprietary FGLRX graphics driver

One with post-release updates, and one without. After searching for which one to install, I found this page, http://askubuntu.com/questions/66707/differences-between-the-2-fglrx-graphics-drivers

From that page, one of the answer says that the one with 'post release updates' will install Catalyst 11.9 (latest version) and the one without 'post release updates' will install Catalyst 11.8, and there has been issues with the 11.9 driver with Unity.

The safest bet is to install the Catalyst 11.8 (the one without 'post release updates').

Hope the installation goes well and the new driver can improve the performance of my ubuntu.