64-bit Confusion

My requirements are PHP and MySQL running stable on CentOS and dual Opterons.

The question is whether to install the 64-bit or 32-bit version of CentOS. I wanted to use a control panel such as Directadmin, but the more I hear about 64-bit, the more I hear problems, especially with PHP and MySQL.

Should I go the 32-bit route, or am I wasting my system resources this way? What do most of you guys do?

 

 

 

 

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