After installing Cat 12.3 I could not get MSI Afterburner to work when Unofficial OC'ing was enabled. Thought it was a bad install of Catalyst. After mucking around for 5 hours installing/uninstalling stuff I went over to Guru3D's site hunting for an answer. And I found one ---> [GUIDE] Enable unofficial overclocking after Catalyst 12.2. Unfortunately for Afterburner users the author, Alexey Nicolaychuk aka Unwinder, will soon be removing Unofficial OC support (Link). probably with the release of Beta 16. I can confirm you can get Afterburner 2.2.0 Beta 15 to work with Catalyst 12.3 using the suggestion in the very first post in that "Guide" thread, if yo can get the DLLs mentioned in it. I cannot add those files to the forum as I would be breaking the law, like I posted here and we cannot have the forum admin doing that.
Anyhoot, if anyone has any questions or needs additional assistance please post in this thread or PM me.
F$