That's odd, which memory are you using?
Don't know if this has already been discussed on this thread but have you tried out Manual per CCX overclocking? This was the best way of getting performance boost for me over PBO, it also means you find out which CCX performs the best for games. I also managed to get a score over 10,000 in R20 with this method with my 3950x. Which is mental...
On how to do it check out this video.
I've found about 50mhz difference on the same chiplet, and around 200mhz between separate chiplets (for 3900x and 3950x users). So if you are using a 3900x you might get a nice surprise in performance when you start to test depending on if you got lucky or not.
If you do this you will however need to start setting CPU affinity to the best performing cores for games, as well as other apps to the others, The new Windows 10 scheduler sort of works but its not foolproof yet.
If you are hunting for max FPS (like me making the mistake of buying oversized high FPS monitors), making sure the cores that are running say RF2 has nothing else running in it to max out headroom for the GPU, especially making sure Teamspeak and Discord are set to other cores. Easier said than done, in the end I got Process Lasso to remember which cores to use for each app.
https://bitsum.com/
I am rocking a 3950x which is overkill for gaming I know, but the bin is awesome and have one of the CCX's manually set to 4.5ghz (it got 4.6ghz R20 stable!) which along with setting CPU affinity getting amazing results. RF2 on triple 1080p ultrawides at a range of 120-160hz at high settings with a 2080ti. Absolute dream considering this sim is a pig in terms of performance on triples especially on the startline and early laps.