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All AMD R6xx chips are 65 nanometre

However, we did not know then that AMD did not order just a respin, but the company got an attack of bravery, didn't take the R520/R580 route, and scrapped the R600 altogether.

The 80nm R600 die - as it was leaked - will now come to life only in a very limited amount of chips, since AMD decided to solve their problems by pulling all resources to go 65nm across the board, including this 720 million heavy monster. This drastically reduces power consumption and enables AMD to clock R600 to 1 GHz or even more. Mass production R600 WILL BE 65nm.
http://uk.theinquirer.net/?article=38292