Database Support Matrix for Dynamics Axapta ver 3 & 4

You may need your partnersource logon to view this. It shows which version of AX 3.0 and 4.0 are compatible with SQL versions of 2000 & 2005.
https://mbs.microsoft.com/partnersource/resources/support/selfsupport/hottopics/axapta/AX_Database_SupportMatrix.htm