Following on from my post SQL Disk Space Error Installing SCAC 2012 I contacted Microsoft Premier Support to confirm the supported service pack levels for SQL Server 2008 because the release notes were very wooly as to whether Service Pack 3 was supported as well as the stated Service Pack 2.
Here is the response I recieved from them:
When I sent my request to the product group, the Group Program manager for SC 2012, replied back that those products listed are the only ones that were tested and thus fully supported.
It is entirely possible that you could run with SQL 2008 SP3 with no issues, but if a problem is encountered related to the databases we may request you relocate the database to one of the listed SQL platforms.
Until SQL Server 2008 with Service Pack 3 is recognised as tested and supported, I’d recommend that you just go with Service Pack 2 and install the latest Cumulative Update, which is currently Cumulative Update 9.