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The updates found at http://developer.amd.com/gcc.jsp are used to update the compiler shipped with the distributions to one that provides additional support for AMD products. No updates are available for RHEL5 at this time because RHEL5's gcc compiler already contains the best available support for AMD products, and RHEL5 U1 will contain additional enhancements.
Likewise, Fedora 7 probably has the best compiler in it. If you're looking for a specific feature that's not in the native package, the RHEL4 packages should* work. We make both GCC 4.1.2 and GCC 4.2 packages available because we noticed a regression in one benchmark for GCC 4.2 mainline vs. 4.1.x mainline, so GCC 4.2 might provide the best performance, then again, it might not.*
* - Your mileage may vary. Fedora is not a package we traditionally support, so we haven't tested these ourselves.