Our compute nodes have Intel Xeon 5130 processors; these are 64-bit processors, which fall under the category of the Intel codename nocona.
To compile code that is optimized for our Intel Xeon 5130 processors, use the following GCC options:
-O3 -mtune=nocona -ffast-math
If X11R6 libraries are needed, be sure to link to the 64-bit version of the libraries at /usr/X11R6/lib64