Intel-VT and DEP

I know the 5000 series XEONs in the Mac Pro support both data execution prevention (DEP) and hardware assisted virtualizaiton (Intel VT). Is there a way to turn these on since there is not EFI interface?

VT would be to help running a VM like Fusion. Leopard has its own type of random address.
http://en.wikipedia.org/wiki/DataExecutionPrevention
Mac OS X for Intel supports the NX bit on all CPUs supported by Apple (from 10.4.4 – the first Intel release – onwards).
http://en.wikipedia.org/wiki/Executablespace_protection#Mac_OSX
The general technique, known as executable space protection, is used to prevent certain types of malicious software from taking over computers by inserting their code into another program's data storage area and running their own code from within this section; this is known as a buffer overflow attack.
http://en.wikipedia.org/wiki/NX_bit
DEP provides no address space layout randomization (ASLR)
http://en.wikipedia.org/wiki/Addressspace_layoutrandomization
and I know I read an article when Leopard came out, that it supports ASLR.

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