Using 2 sticks of Single Ranked RAM sticks will use 128-Bits. 1 stick of 8 chips on one side will require 64-Bits. But otherwise, true 90%+ of the time and I'm trying to keep this short). Not ALL Single Rank modules are single sided. (Side note: Not ALL Dual Rank modules are double-sided. Which means if you remove the heat spreader, you will have all of the IC's on one side of the PCB. Most if not all DDR4 8GB sticks are Single Rank. Which is why 4 of them would give performance boosts because they add up to the 4 ranks (256-bits), but if they existed, you'd also yield the performance increase since it would total 4 ranks. 2x8GB "Dual Ranked modules" aren't likely to exist in DDR4 any longer.
Using 2x16GB "Dual Ranked modules" total 4 ranks, will yield the performance increase. Regardless of using 2x16GB or 2x8GB, if they are Single Ranked modules (128-bits total), you are losing out on performance regardless of your timings and memory frequency. It's something about allowing more cycle to start while more are finishing. It's that using full "4-Ranks" (256-Bits) will be optimal because of the memory cycles. Apparently, it's not the "4x8GB" that helps the Zen3, or "2x16gb" being the sweet spot.
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