So I moved my forums to a new web server setup I did using CentminMod. I'm using Memcached + Zend Opcache as well for caching. I don't have a big forums but I've been checking on the Memcached stats as shown below.
Pingdom website speed test:
Discussions: 4,098 Messages: 26,041 Members: 3,666
CentOS 6.5 64-Bit
Is it doing it's job? I've noticed a difference in site speed since I moved to CentminMod.