Hello everybody,
today i have upgraded one of my rigs which resulted in having 9 cards running on it.
I also upgraded and installed to driver version Adrenaline 18.3.4.
Then i realized that afterburner pushed out a new version 4.5.0
After installing and ramping up everything i realized that afterburner is now showing my all 9 GPU's :-)
There is nothing written in the changelog - but it seems they have been silently enhanced it to support more than 8 GPU's.
See screenshot:

I just wanted to let you know as there are many ppl outside who like to use AB for their convenience.
Cheers,
Afterburner always showed all GPUs in that drop-down list. there's nothing new here, man