Hi,

The sp2 for sqlserver 2008 RTM (IA64\x64\x86) was released on 9/29/2010.

Version no will be 10.0.4000

http://www.microsoft.com/downloads/en/details.aspx?FamilyID=8fbfc1de-d25e-4790-88b5-7dda1f1d4e17

Cheers!