It might not seem like the best place to post this, but I wanted to get a programmers opinion on the matter. I have been looking into getting a dedicated server. I was going to go with the linux centos operating system. I was wondering if there was a difference between the 64 bit system and the 32 bit system that I should be aware of. I would assume that the 64 bit system is better but I was wondering about compatibility issues. Will I have issues using popular scripts and CMS systems on it.
There are very few things that will run worse on a 64 environment compared to a 32 but there are lots of things that don't take advantage of 64 bit processing. As your looking at Linux I will assume that your intending to use Apache and MySQL in which case you just need to check how these run in 64 bit (and I'd be surprised if it isnt well)
64-bit servers certainly have a performance edge over 32-bit ones. And as it is the responsibility of the hosting provider to get all essential things working, you should get a fully functional webserver (Apache), RDBMS (MySQL), and all other things required for hosting. Once these have been setup (by the webhost), it wouldn't matter to the various CMSes what lies underneath. They'll work as they have to.