Hi at all. i've a problem on my costumers with a CPU Usage of SQL 2k8 R2 std. I've update the server from Express to Std, but i've a problem, it always use only one core. I've try to modify the affinity and the MAXDOP some time it's solve this issues, the SQL server start to use all Core i've a DELL server with 1 CPU 6 core 32GB Ram hdd SAS 15k win2k8 r2 std but some time nothing change .. .in this moment SQL Server use 17% of CPU and it corrisponding to 1 core and the system was very slow, it take 24sec for give a response to a query ... How i solve this issues? Thanks for the help.