They are the drivers for ATI cards. Install them and always kep them updated they fix card glitches with some games and increase your performance. I also believe that without the drivers the cards wont work properly.
Yea, Catalyst drivers are ATi's main drivers. You're probably using the default that came with windows for any ATi class cards, which will cause them to perform horribly. Use the Catalyst drivers for better image quality and better performance.
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