Do not use voltages that are too high for SOC and DRAM. The calculator will tell you which range of values you should try for a stable result. Generally, the best SOC values fall between 0.97–1.025 V.
Jitter occurs when riding or falling edges occur at times that differ from the ideal time. Some edges occur early, some occur late. In a digital circuit, all signals are transmitted in reference to clock signals. The deviation of the digital signal as a result of reflections, intersymbol interference, crosstalk, PVT (process-voltage-temperature) variations, and other factors amounts to jitter. Some jitter is simply random.
Always use extra cooling for RAM. Lower voltages also mean less heat. By reducing the heat, you reduce the thermal radiation and decay, which makes your system more stable.
A change to procODT or RTT is required when the system does not POST, has a huge number of errors, or a BSOD occurs.
Single and rare errors can be fixed by manually changing the following timings: (1) tFAW (tRRDS *4 <= best value <= tRRDS *6), (2) increasing tRRDS by 1 or 2, or (3) changing tRTP (from 1/2 * tWR to 12).
Single and rare errors can be fixed by changing tRDWR (from 6 to 9) and tWRRD (from 1 to 4). Note that timings must be configured in pairs. Example: tRDWR 6 and tWRRD 2, tRDWR 6 and tWRRD 3, tRDWR 6 and tWRRD 4, tRDWR 7 and tWRRD 1, and so on.
Single and rare errors can be fixed by changing tRFC. The calculator suggests several options for tRFC. Also, do not forget that tRC is a multiple of tRFC. For example, tRC = 44 -> tRFC 6 (or 8) * 44; tRFC 2/4 does not need to be configured for Ryzen.
Enabling Geardown can improve system stability.
VDDP can improve the stability of the system. The recommended range is 855 mV to 950 mV. Try increasing it in steps of 10–15 mV.
Disabling spread-spectrum can improve the stability of the system.
The source of errors can also be Windows, which is not necessarily a problem with overclocking.
Increasing tRCDRD and tRP by 1 can improve stability and reduce memory voltage requirements.
RTT_NOM disabled will sometimes have better stability.
Increased resistance for RTT_PARK or procODT can improve stability.
Do not forget to follow the rule tRC = tRAS + tRP.