I installed eaccelerator on our dedicated server
I went to the settings for W3, and the option was not selectable from the dropdown menu (greyed out).
I checked to see if it was installed by running:
php -r 'phpinfo();' | grep 'eaccelerator'
Results:
eaccelerator.allowed_admin_path => no value => no value
eaccelerator.cache_dir => /tmp/eaccelerator => /tmp/eaccelerator
eaccelerator.check_mtime => 1 => 1
eaccelerator.debug => 0 => 0
eaccelerator.enable => 1 => 1
eaccelerator.filter => no value => no value
eaccelerator.log_file => no value => no value
eaccelerator.optimizer => 1 => 1
eaccelerator.shm_max => 0 => 0
eaccelerator.shm_only => 0 => 0
eaccelerator.shm_prune_period => 0 => 0
eaccelerator.shm_size => 16 => 16
eaccelerator.shm_ttl => 0 => 0