Catalyst v4.1 m165

[emilianomorgia]

how new?

this weeks machines?

What do you mean ?

Can't be possible that  do not allow downgrading

[samsc]

What do you mean ?

Can't be possible that  do not allow downgrading

apple released new mac pro this week January 2008.
They will not likely boot into tiger.

Apple does not usually ever allow downgrade on new hardware after a major OS release or hard ware change

Apple does not typically release new hardware than runs or even installs on old OS.