AMD Ryzen Memory Tweaking & Overclocking Guide 179

AMD Ryzen Memory Tweaking & Overclocking Guide

Benchmarks: Presets & System Configuration »

Handy Tips and Tricks

  • 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.
  • CLDO_VDDP. Best values: default (850 mV), 950 mV, 945 mV, 940 mV, 915 mV, 905 mV, 895 mV, 865 mV, and 840 mV.
  • Even values for tWRWR SCL and tRDRD SCL can improve system stability. For example 4-4 or 6-6.
  • Excessive overclocking of the processor can negatively affect the stability of the RAM.
  • CAD_BUS 24 30 24 24 can be useful for configurations with two modules, and 24-20-24-24 for configurations that consist of four modules.
  • Look out for motherboard BIOS updates that include updates to AGESA as newer versions improve memory-tuning capabilities.
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May 28th, 2022 10:59 EDT change timezone

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