Doesn't AMD uninstall the other versions automatically when installing a new version of CCC? I seem to recall it performing a preprocess that handled all of that when upgrading to my R9 290x... In any case, I would recommend downloading the latest from the website - rather than using the disk that it comes with.
You can look at the benchmarks, but I believe Intel CPUs have been the top dogs for quite some time now. Always been interested in an octacore processor from AMD, but the benchmarks of the Intel i7's blew the everything AMD made out of the water at the time I was looking to upgrade.