The AMD Catalyst™ 12.1 Preview includes all of the features found in AMD Catalyst™ 11.12 and also includes all of the latest optimizations found in the AMD Catalyst 11.11c performance drivers (AMD Catalyst 11.12 does not include the latest 11.11c optimizations). It is highly recommended that all gamers use the AMD Catalyst 12.1 Preview driver.
Feature highlights of the AMD Catalyst™ 12.1 Preview driver:

AMD HD3D technology support enhancement

· Enables support for AMD HD3D technology in conjunction with AMD CrossFireX configurations

· Delivers a new Stereo 3D mode over HDMI 1.4a connections - 1080p at 30Hz is now enabled on supported displays.

AMD Catalyst Control Center / Vision Engine Control Center enhancements – Application Profiles

· AMD Catalyst 12.1 Preview driver enables users to create per application profiles to individually control 3D and CrossFireX settings for Direct3D applications

· Please be sure to select the “Restore Factory Defaults” option under the Catalyst Control Center Preferences menu before using the new application profiles feature – this ensures there are no compatibility issues between previous drivers and the new AMD Catalyst 12.1 Preview driver with regards to application profiles

AMD Catalyst Control Center / Vision Engine Control Center enhancements – Video UI improvements

· AMD Catalyst 12.1 Preview driver includes user interface enhancements to simplify adjustment of video color and video quality control.

Performance highlights of the AMD Catalyst™ 12.1 Preview driver (in addition to the AMD Catalyst 11.11c performance driver)

· Improves performance (10-15%) in Elder Scrolls: Skyrim when Multi-Sample Anti-Aliasing is enabled on the AMD Radeon™ HD 6900 Series for single GPU and AMD CrossfireX configurations

http://support.amd.com/us/kbarticles/Pag...river.aspx