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The easy way is to save any overclock on other components like the CPU and GPU and then reset to default this will ensure that any instability while testing can only come from the RAM overclock. As RAM overclocking is time-consuming, it is wise to exclude any other factors of possible instability. Also, ensure that any overclock is saved in the BIOS to profile and well as any GPU to a profile. Also, make sure you have a baseline of the XMP profile from Aida64 or MaxxMEM2 with any CPU overclock applied since the memory OC will show a significant increase with or without a CPU overclock. And you also want a baseline to measure against when you revert all other overclocks. You can write down or save a screen capture of the Read, Write, Copy and Latency of the memory performance and use it as a reference when overclocking your memory. Reset the motherboard to default settings from within the BIOS before proceeding.
Tips for AMD.
Runnings a 1:1 ratio with MCLK and FCLK is best for Ryzen. Only use higher RAM Mhz speeds when your infinity fabric can keep up. When maxing out the infinity fabric go for tighter timings as de-syncing will decrease performance.
Gear Down Mode is useful for reaching higher frequencies and can be seen as CR 1.5(T1.5/N1.5)but will lock out the option to select CR2. As well as forcing tCL to even numbers, for example, C15 is set to C16 with GDM.
CLDO_VDDG can in some cases help with stabilizing FCLK overclock on the Ryzen 3000 series. This only applies when manually adjust both SoC and CLDO_VDDG voltages and should be done as a pair. With an SoC voltage of 1.10v, the CLDO_VDDG voltages will drop depending on the SoC LLC by roughly ~ 40mv to 1.01mv if left on Auto. So adjusting CLDO_VDDG manually you will have to ensure the SoC voltage drop under load is 40mv or less.
Tips for Intel.
Increasing Ringbus clock speed will increase performance; however, make sure the CPU overclock is stable before overclocking the DRAM and after.
ASUS Maximus Tweaks will tighten RTLs and I-OLs values. Mode 1 works up to 4000Mhz and Mode 2 works above 4000mhz.