Using OPcache with CACHE_LIBRARY in a concrete5 website

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I want to use OPcache for my concrete5 website. The website is hosted on a server where OPcache already installed and configured. How do I use it for my concrete5 website?

I tried setting the CACHE_LIBRARY variable in config/site.php but the site breaks if I do that. I tried the following:
define('CACHE_LIBRARY', 'opcache')

define('CACHE_LIBRARY', 'OPcache')


memcache is also installed on enabled on the same server. If I use memcache as the cache library for my concrete5 website, does it mean that it will use OPcache for caching?

Any help would be much appreciated.
Thanks.