In message <2DB91188-6892-49D5-879F-697E7CB7D1AD at gmail.com>you wrote: > Found that too, was wondering whether -march=athlon64 is optimal for > the Xenon? Gentoo docs recommend > > -mtune=nocona Feel free to modify it whatever you think gives best results on your machines. -march=athlon64 was just something that made sense on ours. Andreas