Well, EM64T is a programming library that supports advanced functions available on 64 bit processors running 64 bit operating systems.
Looking at the Intel web site, it looks like they replaced the EM64T name with VT. At least for processors.
"The CPU needs to support VT and it needs to be enabled in the BIOS. Hence the board as well needs to support VT."
From this thread:
http://communities.intel.com/message/60934
In addition, as is spelled out in the thread, you need to be running a 64 bit OS for the EM64T instructions to be enabled.
Also, comparing your E5430 with a newer E5530 processor, some of the differences include that the E5430 does not support Turbo Boost, Hyper-Threading and VT-d Advanced Technologies.
Chas