I've tightened my tRCD and tRP to 36 from 37. My previous timings (28-37-37-65) held stable at 2/3/1 nitro mode with 9 hours of Y-cruncher SVT and 200 cycles of TestMem5 Ryzen3D Anta777 for 10+hours.
Due to Aida64 being inconsistent, I've calculated 5 runs and found an average latency of 56.5ns.
RAM: Corsair Vengeance 2×16 CL30-40-40-104 DDR5-6400 1.40V Hynix A-Die (Expo).
(PBO has been set to Auto so I could narrow down specific memory errors to cause less confusion)
VDD – 1.55V
VDDQ – 1.50V
VDDG (CCD) – 1.03V
VDDG (IOD) – 1.03V
IOMMU – Disabled
SwapBank-APU, iGPU – Disabled
Power Down Mode – Disabled
Memory Context Restore – Disabled
Data Scramble – Disabled
TSME – Disabled
ECC – Disabled
Gear Down Mode – Disabled