H.264 Hardware AccelerationThe full changelog can be read over here.
Catalyst 5.13 software suite introduces H.264 hardware acceleration for the ATI Radeon X1800, X1600, and X1300 product line. H.264 is advanced video coding that provides significant reduction in bit-rate compared to standards such as MPEG-2 and MPEG-4. The ATI Radeon X1800, X1600, and X1300 products provide hardware acceleration for the playback of high-definition content that is encoded using H.264. Using the Catalyst software suite 5.13, along with the Cyberlink H.264 decoder available from http://www.ati.com/technology/h264.html provides H.264 hardware acceleration.ATI CrossFire Support for the ATI Radeon X1800
ATI CrossFire allows for multiple Graphics Processing Units (GPUs) to be placed within a single PC, to provide superior gaming performance. The Catalyst 5.13 software suite is the first Catalyst to provide ATI CrossFire support. CrossFire support is available when an ATI Radeon X1800 CrossFire Edition product is installed with another Radeon X1800 product. Further information on ATI CrossFire can be found at: http://www.ati.com/technology/crossfire/faq.htmlHQV Video Benchmark Support
The Catalyst software suite 5.13 introduces full support for the HQV DVD Benchmark. These driver tweaks provide a better DVD image quality, and higher benchmark scores.
You can download the drivers over here.