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509 had R9 3900X, when moved to a R9 5900X same RAM kit nailed same profile with same voltages. Moved to a R7 5800X3D recently, with ASUS ROG Crosshair VIII Dark Hero.
Knocked:-
tFAW from 24 to 16
tWRRD from 7 to 6
tWRWRSD from 7 to 6
tWRWRDD from 6 to 4
tRDRDSD from 5 to 4
tRDRDDD from 4 to 3
Made no benching results difference.
CPU/RAM will hold 3800/1900 at stock SOC/VDDG/VDDP/VDIMM/VTTDDR, but slight bumps on SOC/VDDG/VDDP yielded less run to run variance in benches so kept them.