upgrade from 7.1

I am running Redhat 7.1 on a dual cpu ia64 Dell 7500.
I'm running some scientific simulations, and finding
I'm getting different answers for identical reruns
of the same program, and it looks like I'm having memory
corruption problems. I'd like to see if an upgrade to
7.2 might cure the problems (I've done a lot of debugging
with dmalloc and found no problems with the code). 

I can't seem to find any ISO's to use to upgrade.
Can anyone point me to a location, or place
to obtain them? I can probably get my supervisor
to pay a bit for physical CD's.

Is there any upgrade more recent than 7.2
that doesn't involve a 1500 dollar per year
Advanced Server? We simply don't have the budget
for that.


-- 
Greg Hennessy
[email protected]
3450 Mass Ave NW
Washington DC, 20392