Xeon X5680 IA64 or x64 SQL SP2 upgrade?

Related to http://social.msdn.microsoft.com/Forums/sqlserver/en-US/49492155-c22c-46fe-9e92-b80dd9d95ffb/upgrade-sql-server-from-105016001-to-105040000?forum=sqlsetupandupgrade

I'm seeing downloads for

• SQLServer2008R2SP2-KB2630458-IA64-ENU
• SQLServer2008R2SP2-KB2630458-x64-ENU

Sorry if this is OT, but can someone tell me if my Xeon X5680 server is IA64 or X64?

Thanks,

Scott