Confused about ATI drivers

I have a Sapphire Radeon 9700 card and looking at Sapphire's web site, the latest drivers are 7.84, which I have downloaded but yet to install.

I have noted that some people refer to Catalyst driver and I am confused as to what the difference is, if any, between these and the drivers that appear on Sapphire's web site.

I dno't know if this is related but I am unable to select the FSA option in games although I believe that this is supported by the card.

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