http://blogs.technet.com/b/raymond_ris/archive/2012/09/19/august-cumulative-update-out-now.aspxFrom the August Cumulative Update onwards you will have to install sp1. For mor details on this please check Brians Blog: http://blogs.msdn.com/b/brismith/archive/2012/07/18/project-server-2010-from-august-2012-cumulative-update-onwards-you-will-alsoen-USTelligent Evolution Platform Developer Build (Build: 5.6.50428.7875)