SQL Server 2012新服务器 - 更多物理内核或更快的CPU

I am configuring a new Dell server to run SQLServer 2012 Enterprise. I have a option to purchase a server that has 12 cores per physical socket (CPU) at 2.7Ghz or a server having 8 cores per CPU at 3.3GHz. I will hae 2 physical sockets (CPUS) The server runs both OLTP and OLAP processing. What would give me the best performance for SQL?I am configuring a new Dell server to run SQLSe