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AMD First with OpenGL 4.0 Compliant Graphics Driver

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@devguy

Indeed!! Unreal 2, Unreal Tournament 2, Counter Strike, Half Life, Quake 3 Arena, Serious Sam, and some other games are using the tessellation option when they detect an ATI card. But the feature was actually implemented or coded in game not in the DX driver...I think...

Anyway that feature wasn't called Tessellation but, ATI TruForm

http://ixbtlabs.com/articles/atitruform/

http://www.anandtech.com/showdoc.aspx?i=1476&p=4

Interesting. From Wikipedia:
This unit is reminiscent of ATI's earlier "TruForm" technology, used initially in the Radeon 8500, which performed a similar function in hardware.[5] While this tessellation hardware is not part of the current OpenGL or Direct3D requirements, and competitors such as the GeForce 8 series lack similar hardware, Microsoft has included Tessellation as part of their D3D10.1 future plans.[6] The "TruForm" technology from the past received little attention from software developers and was only utilized in a few game titles (such as Madden NFL 2004, Serious Sam, Unreal Tournament 2003 and 2004, and unofficially Morrowind), because it was not a feature shared with NVIDIA GPUs which had a competing Tessellation solution using Quintic-RT patches which met with even less support from developers.[7] Since the Xenos contains similar hardware, and Microsoft sees hardware surface tessellation as a major GPU feature with proposed implementation of hardware tessellation support in future DirectX releases (presumably DirectX 11),[4][6] dedicated hardware tessellation units may receive increased developer awareness in future titles. It remains to be seen whether ATI's implementation will be compatible with the eventual DirectX standard.

And about the R600 tessellator.
 
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