A quick tip on how to find out whether your server is running on 64 bit CPUs or 32 bit architecture.
Log in via SSH and simply type:
uname -a
And it would return something like this:
Linux example.com 2.6.17.8-node22 #2 SMI Tue Aug 11 19:14:36 UTC 2009 i686 GNU/Linux
If it’s i686, i586, etc., it’s 32 bit. If it’s x86_64, it’s 64 bit architecture.