/dev/null

GCC (4.5.3) flags for

* Intel(R) Core(TM) i7 CPU M 620
* Intel(R) Core(TM) i7 CPU 920
* Intel(R) Core(TM)2 Duo CPU T7700

CFLAGS="-march=core2 -mtune=generic -O2 -pipe -msse -msse2 -msse3 -mssse3 -msse4.1 -msse4.2 -msse4 -mmmx"
CXXFLAGS="${CFLAGS}"
CHOST="x86_64-pc-linux-gnu"

USE flags

USE="64bit X a52 aac alsa apng bash-completion bluetooth chroot
     connection-sharing consolekit dbus dhcpcd dts dvb dvd extras faac ffmpeg
     gcj gif gnome-keyring gnutls gpg gtk gudev imap iproute2 iscsi jpeg lame
     lvm mmx mp3 mysql network networkmanager ogg opengl perl pkcs11 png
     policykit pulseaudio python qemu resolvconf sasl sdl smtp spice sse sse2
     ssl tiff truetype udev vim-syntax virt-network vorbis wifi x264 xcb xvid
     -kde -qt4 -ruby"

additional flags

MAKEOPTS="-j10"
FEATURES="buildpkg"
VIDEO_CARDS="intel"
LINGUAS="en de"
INPUT_DEVICES="evdev keyboard mouse synaptics"
QEMU_SOFTMMU_TARGETS="x86_64 arm i386 ppc ppc64 sparc sparc64"
QEMU_USER_TARGETS="arm i386 ppc ppc64 sparc sparc64 x86_64"

Usage
Host system http://mirror.devnu11.net/gentoo/

PORTAGE_BINHOST="http://mirror.devnu11.net/gentoo/packages/"
FEATURES="getbinpkg"

If you still need more information? Ask!