In general,
FX8xxx is very slow and very power hungry for today's standards.
There is no big issues in term of core count but extremely big issue on the single thread department for some new AAA games, especially if you have over 100fps as goal.
However...it is not as easy to explain...
Games are made differently, some more GPU dependent, some more cpu dependent, some gain benefit from more cores/threads, some from faster cores/threads, etc.
Some new AAA games are really processor intensive and can gain benefit of both faster and more cores/threads.
There is also more to the topic, e.g. if you are planning to game at 60fps or over 100fps. The higher the fps goes, the more strain it put to the processor, assuming that the GPU still play along.
"assuming that the GPU can still play along" --> this is where resolution and graphic effect settings play a big role too.
I am even still using my E3-1231V3 (I7 4770 without the iGPU) for gaming. This still does the trick, I am relying on GSync to smoothen up games a bit for lower FPS. I am holding back on big upgrade until I know what it takes to run Cyberpunk 2077 final release properly.