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Sorry I did not give enough details in the first email. I was thinking it would be an easy answer like real variable default for the 32 bit gfortran is 4 bytes and 8 bytes for the 64 bit gfortran. I have included original email below along with more details. I appreciate all the quick replies and excellent advice I have gotten from the group. Thanks, Mike original message: I am running a nonlinear finite element problem on both a 32 bit Intel Centrino Duo and an AMD64 3200 machine. The identical problem cannot reach convergence on the 32 bit machine but converges on the 64 bit machine. Does the 64 bit gfortran have greater precision in floating point and integer numbers? additional details: My version of gfortran: [root@localhost ~]# gfortran -v Using built-in specs. Target: x86_64-redhat-linux Configured with: ../configure --prefix=/usr --mandir=/usr/share/man --infodir=/usr/share/info --enable-shared --enable-threads=posix --enable-checking=release --with-system-zlib --enable-__cxa_atexit --disable-libunwind-exceptions --enable-libgcj-multifile --enable-languages=c,c++,objc,obj-c++,java,fortran,ada --enable-java-awt=gtk --disable-dssi --enable-plugin --with-java-home=/usr/lib/jvm/java-1.4.2-gcj-1.4.2.0/jre --with-cpu=generic --host=x86_64-redhat-linux Thread model: posix gcc version 4.1.1 20070105 (Red Hat 4.1.1-51) I am using the same version and OS on the 32 bit machine. compiler options used for both compilers can be seen in the attached make file. The only difference in the make files is where it searches for libX11.so: LIBS = /usr/lib64/libX11.so Thanks, Mike
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