Centos 5 or 5.0

[Centos <centos@xxxxxxxxxxxxxx>]

Hello

I am downloading Centos, but I don't know What is the difference between 
Centos 5 and Centos 5.0

also as far as I remember any rpm or file ending with 64 designed for 
AMD 64 bit,
can I install CentOS-5.0-x86_64-bin-DVD.iso on Intel 64 bit as well ?

Thanks

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