Thanks for your answer and sorry for my late reply !
No I didnt ! Adaptec 3805 present FW is "5.2.0 b15728 " from April 2008.
Asus M2N-X is v 403 dated may 2007. There has been 6 new non beta bios afterwards !!
Maybe this could be good to update MB bios and 3805 bios but I'm afraid I will never feel secure with this! I'm already looking what MB have 8 stata connectors !!!
Great thanks again.
Greetings to all.