I was just wondering if anyone has any information on available Fortran compilers for the 64 bit Opteron. I have a few large fortran models for fluid dynamics that I would like to recompile on my dual 250 Opteron system. They would really benifit from 64 bit operations and enhanced parallel processing. I am running Windows 64 bit enterprise edition, but I only have the intel Fortran compiler for 32 bit windows. I know that the Portland Group has a compiler, but I would like to know what else is out there and what experiences people have had with them. Thanks in advance for your help.