intel Zeon Processor

I am trying to setup Symatec Endpoint protection Manager on my server. Symanted forum specs says that it needs to have a Intel Zeon with EM64T support, or a
Intel Pentium IV with EM64T support. My server is running a Intel Zeon E5430. They are both Zeon’s what does “WITH EM64T SUPPORT” mean. I am assuming they are diffrent processors.