Assassin's Creed is the 1st DX10.1 game Read the review of AC here. However, you can read ATI's response here. This marks the 1st game that uses DX10.1 since SP1 was released on Feb 4, 2008. As you can see, it clearly improves AA performance for the 3870X2. I can only assume it would improve performance for the 3870 and 3850. I hope to see more titles implement DX10.1. If so, I am sure many will flock to Vista using a ATI's 4000 series video card. Also note that it appears that ATI developer relation team is finally reaching out to a gaming developer prior to the game's release.