[CentOS] 64 bit hardware and filesystem size limit

We recently bought a 32-bit Xeon system with a 12-port 3Ware RAID card
and a dozen 500GB drives.  We wanted to create 4TB drive arrays;
however, we soon discovered that there is about a 2.2TB drive array size
limit on 32-bit hardware.  Does that sound correct?

Would replacing the 32-bit mobo/cpu with a 64-bit mobo/cpu allow us to
use drive arrays larger than 2.2TB?

Thanks.