hello,
i just found that : http://www.nvnews.net/vbulletin/showthread.php?t=121200&highlight=fsaa fsaa value for 4x Bilinear Multisampling have change from FSAA 4 to FSAA 5. don't really understand why, but i'm tracking this problem since a long time... (why FSAA 4 had no effect on recent nvidia driver)
i think it can be useful for someone else...
Cyrille