Squilliam on 01 September 2008
It hasn't really even been used yet.
http://ati.amd.com/developer/Eurographics/2007/Tatarchuk-Tessellation(EG2007).pdf
Read all about it.
Essentially it speeds up triangle rendering by a massive amount and saves a crapload of memory in the process (Laymans terms) So you see they can make the models and landscape look more realistic. Just look at the PDF and you'll see.
Tease.
