At the time of this writing, W3TC only recognizes the php5-memcache (vs. php5-memcached) PHP client for memcached memory object caching system/software.
Hence the “Memcache extension: Installed” in W3TC compatibility test for memcached.
Memcached being useful and efficient as a caching method for database and/or object user/data caching via W3TC, even on a single server setup, besides APC or Zend Opcode (PHP 5.5 core).
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