NX on x86_64

["Jay Lee" <jlee pbu edu>]

Does anyone have hard numbers on how effective NX has been in preventing
exploits?  RHEL3 seems like a good platform to compare NX to non-NX.  So
in terms of vulnerabilities discovered and patched on RHEL3 how many have
been exploitable on x86 but not x86-64 because of the NX feature?  Hard
numbers would be great but even an informed guess would help.  I know it's
not the end all/be all security solution but I'd like to start pushing for
it here if there's even a 10% decrease in effective exploits with it. 
Thanks for any info you can provide or point to.

Jay
-- 
Jay Lee
Network / Systems Administrator
Information Technology Dept.
Philadelphia Biblical University
--
It's psychosomatic. You need a lobotomy. I'll get a saw.  --Calvin