In my continued RAM OC research, I came across some interesting settings posted by domdtxdissar in [Official] AMD Ryzen DDR4 24/7 Memory Stability Thread | Page 404 | Overclock.net (page 404, post 8075). They looked like an improved version of what I had previously been using. Of course, I still don't know WHY they work. Hopefully, as I continue to study, things will clarify, and I can graduate from copy/paste to test/refine with some idea of what I'm doing.
L3 read/latency is still not quite what I was hoping for, but its better. I'm unsure if the reason my L3 values tend to lag those of the "prosumers" that post the settings is related to the fact that they tend to run 4x8GB while I am running 2x16GB . Perhaps I will read further and learn the answer.
Time to fire up HWiNFO64 and TestMem5 (x25 cycles 1usmus) and begin to confirm stability. Hopefully HWiNFO64 doesn't bug out and I get accurate peak temperature readings. I guess I should turn the logging function on so I can check and see if any high-ish values are momentary blips or true temperatures. DRAM voltage is set to 1.560...
Edit: If the DIMMS go over 45⁰C, I'm pretty sure I'll get errors, and I'll be hunting for improved RAM heatsinks. If they approach 40⁰C, I'll probably still be looking for better heatsinks. F@k it, I'll be getting better heatsinks.
Edit 2:. I need to revisit J7's comments here in my own build log regarding single rank/dual rank/quad rank. Maybe some of that pertains to L3 read/latency speeds...
Edit 3: No, putting my brain in gear, L3 shouldn't be tied to much in the way of DRAM other than fclk I guess...hmm. So much to learn .