> Intel ifort is 7.7x faster then Linux g95 on MacPro 3.0 GHz > Intel ifort is 2.9x faster then Linux g95 on Dual Opteron 1.4 GHz > Intel ifort is 1.8x faster then Linux g95 on SGI Altix 350 dual > Itanium2 1.4 GHz > OS X g95 is 2.7x faster then Linux g95 on a MacPro 2.66 GHz (same > hardware exactly)
That ordering makes little sense to me. The Intel compilers should be the most effective on Itanium, where a lot of functionality has been moved out of hardware and foisted onto the compiler! Have you done these tests with a recent gfortran? (Certainly the gcc people would want to know about it as these must be missed optimisations. But only for the gfortran case.)