Added plus another from that site
I was so surprised how this information was so similar to The Stilt's testing which he posted before, aware it was not his although in AMD article.
From the article :-
DDR4-3200 “maxed” settings: tCL =12, tRCDW/R = 12, tRP = 12, tRAS = 28, tRC = 54, tWR = 12, tWCL = 9, tRFC = 224, tRTP = 8, tRDRDSCL = 2, tWRWRSCL = 2, ProcODT = 60Ω.
DDR4-3466 “tuned” settings: tCL = 14, tRCDR/W = 14, tRP = 14, tRAS = 28, ProcODT = 60Ω, CR = 1T, GDM = Disabled, BGS = Disabled.
DDR4-3520 “tuned” settings: tCL = 14, tRCDW/R = 14, tRP = 14, tRAS = 30, tRC = 56, tWR = 14, tWCL = 12, tRFC = 312, ProcODT = 53.3Ω.
Originally Posted by The Stilt
3200MHz = 12-12-12-28-54-140ns-9-8-12-2-2-GDME-1T (tCL-tRCDR/W-tRP-tRAS-tRC-tRFC-tCWL-tRTP-tWR-tWRWRSCL-tRDRDSCL)
3466MHz = 14-14-14-28-54-192ns-14-8-12-2-2-GDMD-1T (tCL-tRCDR/W-tRP-tRAS-tRC-tRFC-tCWL-tRTP-tWR-tWRWRSCL-tRDRDSCL)
140ns @ 3200MHz = 224 CLK
192ns @ 3466MHz = 333 CLK
He also did 3520MHz.
3520MHz 14-14-14-56-177ns-BGSD = 125.07fps
I think the compare of single rank vs dual rank should have been with BGS Off on single rank IMO.
I noted as soon as that article came up on AMD community site, there were Ryzen owners posting on xyz site should I get dual rank RAM?
To me it seems single rank is still better for OC'ing and tweaking. The gap is small in performance, but the headache that dual rank can give from reading owners posts I'd rather not have. Perhaps as AGESA improve things will get better. Even now after ~4mths from launch, Samsung B die single rank 2x 8GB IMO is the sweet spot for compatibility / stability / OCability / Tweakability.