io ho un AMD 2600+. ecco la mia make.conf:

# These settings were set by the catalyst build script that automatically built this stage
# Please consult /etc/make.conf.example for a more detailed example
CHOST="i686-pc-linux-gnu"
CFLAGS="-march=athlon-xp -O3 -pipe -fomit-frame-pointer"
CXXFLAGS="${CFLAGS}"
USE="-libdv dvd alsa cdr kde qt"
#GENTOO_MIRRORS="http://gentoo.chem.wisc.edu/gentoo/
#rsync://cudlug.cudenver.edu/gentoo
#http://gentoo.oregonstate.edu
#http://www.ibiblio.org/pub/Linux/distributions/gentoo"
GENTOO_MIRRORS="http://www.die.unipd.it/pub/Linux/distributions/gentoo-sources/
http://212.219.247.15/sites/www.ibiblio.org/gentoo/
http://212.219.247.14/sites/www.ibiblio.org/gentoo/
http://212.219.247.13/sites/www.ibiblio.org/gentoo/
http://212.219.247.17/sites/www.ibiblio.org/gentoo/
http://212.219.247.12/sites/www.ibiblio.org/gentoo/"
CONFIG_PROTECT="-*"
#ACCEPT_KEYWORDS="~x86"
MAKEOPTS="-j2"
AUTOCLEAN="yes"
RSYNC_RETRIES="15"
RSYNC_TIMEOUT=40

poi, programi che uso, kde-3.2.2, browsers internet, firefox o konqueror, xcdroast, poi ricompilo usando emerge, e openoffife. Poi i altri non lo so con precisone, peer2peer, cedega (wineX), amule, azureus, point2play. ecco quello che uso piu di frequente.