Renseignez-vous avant de dire des conneries
http://www.pcgameshardware.com/aid,765087/Interview-with-Mafia-2-developer-PC-gaming-will-never-die/Knowledge/
PC Games Hardware: Last year on Gamescom 2009 we talked to Denby Grace who informed us that Mafia 2 offers ONLY a support for DIRECT X 9. What are the reasons to do so? Are there any existing plans to patch in support for DX10/11 later?
Denby Grace: Currently, there are no plans at this time, but I would never say never...
http://www.gamespot.com/xbox360/action/mafia2/show_msgs.php?topic_id=m-1-52705048&pid=942955
Q: Does Illusion Engine support DirectX 10 / 11 technology in Mafia II? UPDATE 2009/12/05
A: No, Mafia II is designed as a DirectX 9 game. You shouldn't experience any trouble when running Mafia II on any newer version of backward compatible DX libraries though.