New
#1091
I've installed a newer catalyst over the older one numerous times without having any major issues with the exception of the 7.9 version seen with the card on the old build. When people were hampered with the 9.4 I simply uninstalled the 9.3 or 9.2 being the one on at the time, restarted and saw the 9.4 install without a glitch.
As for the latest 5-9 the only problem seen is simply the apparent lack of sypport for the old game titles as far as the OpenGL problem people are running into. There wasn't any display issues to note except for the old titles simply refusing to run when going to start each one up.
DX 9c is installed as well to avoid the lack of OpenGL from not having it on following each newer Cat. install but still saw the same result.
As for as the model series if not the 5xxx read the release notes when going for any newer release. That will list the model series that are supported.
The 2xxx are still seeing support showing the 4xxx is still too new not to be supported. The installation not being done correctly would be the likely cause for problems such as a protection program or other software clash occuring. This is why the advice to see the old removed completely before installing the newer latest would be the thing to insure the best results