Configuration
Add to /etc/pacman.conf
# 3.x [linux-pae] SigLevel = PackageRequired Server = http://pae.archlinux.ca/
For the old 2.6 kernel version:
# 2.6.39 [kernel26-pae] Server = http://kernel26-pae.archlinux.ca/
Installation
# pacman -Sy
# pacman-key --lsign-key BADC156D
# pacman -S linux-pae
If you compile modules (for Virtual Box, etc.), install the -headers package:
# pacman -S linux-pae-headers
For kernel 2.6, the package names are:
# pacman -S kernel26-pae kernel26-pae-headers