I'm currently running SQL Server 2005 on a Dell Poweredge 2850 with two Xeon Dual Core processors. I've read different places about the affinity and HT and what not. Can anyone explain to me how man processors I should have check on my processor affinity within SQL. It shows 4. So I'm guessing its showing my dual core processors and HT is turned off in my bios. I'm just looking to find best performance. Right now all 4 processors are checked.