As I have some free time, I’m testing different things with SCCM, mainly in creating different collections that I might need. Bellow you can find the query that will show you all x64 systems, client and server operating systems.

select SMS_R_SYSTEM.ResourceID, SMS_R_SYSTEM.ResourceType, SMS_R_SYSTEM.Name, SMS_R_SYSTEM.SMSUniqueIdentifier, SMS_R_SYSTEM.ResourceDomainORWorkgroup, SMS_R_SYSTEM.Client from SMS_R_System inner join SMS_G_System_COMPUTER_SYSTEM on SMS_G_System_COMPUTER_SYSTEM.ResourceId = SMS_R_System.ResourceId where SMS_G_System_COMPUTER_SYSTEM.SystemType = "x64-based PC"

You can further customize this so it will show you only x64 servers or only x64 Vista systems etc.