Title: Compatibility check – Opcode Not Installed
Last modified: August 30, 2016

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# Compatibility check – Opcode Not Installed

 *  [herzzanu](https://wordpress.org/support/users/sabinhertanu/)
 * (@sabinhertanu)
 * [11 years ago](https://wordpress.org/support/topic/compatibility-check-opcode-not-installed/)
 * Hi,
 * I have installed and set up the W3 Total Cache but when running the compatibility
   check I get the Opcode cache not installed message, though I have it installed
   on my dedicated server.
 * [http://oi59.tinypic.com/2iqjnrd.jpg](http://oi59.tinypic.com/2iqjnrd.jpg)
 * The same happened with Memcache when this was installed though I have uninstalled
   it now.
 * Do you have any idea why this is happening?
 * As a further note, memcache was detected when the server was running PHP 5.4.
   x but after upgrading to 5.5 it doesn’t see these as installed.
 * Thanks,
    Sabin
 * [https://wordpress.org/plugins/w3-total-cache/](https://wordpress.org/plugins/w3-total-cache/)

The topic ‘Compatibility check – Opcode Not Installed’ is closed to new replies.

 * ![](https://ps.w.org/w3-total-cache/assets/icon-256x256.png?rev=1041806)
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## Tags

 * [compatibility](https://wordpress.org/support/topic-tag/compatibility/)
 * [Dedicated Server](https://wordpress.org/support/topic-tag/dedicated-server/)
 * [memcache](https://wordpress.org/support/topic-tag/memcache/)
 * [opcode](https://wordpress.org/support/topic-tag/opcode/)
 * [php](https://wordpress.org/support/topic-tag/php/)

 * 0 replies
 * 1 participant
 * Last reply from: [herzzanu](https://wordpress.org/support/users/sabinhertanu/)
 * Last activity: [11 years ago](https://wordpress.org/support/topic/compatibility-check-opcode-not-installed/)
 * Status: not resolved