|"If there all made my ATI Radeon why are they made by different companys? "|
So that they can be made cheaper.
Up until about 1999, all ATI video chipset cards were made in Canada, by ATI. Since about 1999 they started making them in other countries, and allowing other manufacturers to use their video chips. Now even ATI's own cards are made in other countries.
The Radeon 5770 chips (and other Radeon video chips) themselves are all made by the ATI division of AMD. ATI and AMD merged about 5 years back. The boards you mentioned are "clone" boards made by other companies - in many cases there is ATI made version of a Radeon card as well, but it's more expensive for the same features. The boards vary according to the things in response 2, and which fan they use. If the board also has video capture, or TV out or HDTV out, the chip or chips for that is/are made by ATI. All Radeon cards these days are supplied with ATI drivers and related software rather than software made by the "clone" card maker, with the exception of usually, if not always, only ATI made cards come with ATI DVD decoding (player) software.