I have a quick question about architecture and versions of gcc. We use and ship on Fedora Core 5 with a 2.6.16.16 kernel. We've been using Dell Precision T5400 workstations with an Intel Xeon 5400 series processor and gcc-4.1.0. We have to stay with Fedora Core 5 and 2.6.16.16 for now. But, Dell is shipping us new Precision T5500 workstations with the Intel Xeon 5500 processor and the new "QPI" architecture. I don't know that I need to change anything about gcc; but then again, I don't know that I don't need to change it either... What version of gcc do I need to support QPI? What flags to I need to build gcc with to support QPI? What -march, -mcpu or -mtune (or other) options to I need to build my codebase to support QPI? TIA, -brian