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Updating Intel microcode

# pacman -S microcode_ctl

Then add microcode to the DAEMONS array in Template:Filename.

You may have to replace /etc/microcode.dat with a newer version from the intel site, as of December 5th, 2010, the Arch package has an out of date microcode file.

Note: Microcode updates via software are not persistent - they have to be done at each boot (that's the daemon's purpose) - BIOS updates with the new microcode are a cleaner solution but aren't always available