BIOS Settings.

Zen 2 offers greater stability then the previous Zen architectures and can be used running a stock XMP profile. Do make sure that the DDR4 kit is listed on the QVL list of your respected motherboard. So you can select the XMP profile and make sure the right XMP profile is selected. For this motherboard, the listed XMP profile, in general, is 3466Mhz. However, the XMP profile of 3600C16 can be selected and works just fine. If your DDR4 kit is not listed on the QVL list, then it would be wise to turn on the XMP profile and do a Prime95 or Linpack Xtreme stress test first to make sure the XMP profile is stable.

Ryzen 3700X and Precision Boost Overdrive 2.0.

The AMD 3000 series works really well with PBO, and it can be the safest and fastest way to overlock any 3000 series CPU. PBO 2.0 offers much finer control over the auto-overclock feature. 

There some settings in the BIOS that can be adjusted to use AMD's Precision Boost Overdrive 2.0 to gain the best results some tweaks are needed for a longer boost duration and overriding some limitation from within the BIOS. Important with PBO 2.0 is how the Precision Boost Overdrive Scalar works with the PPT, TDC and EDC. To run a Scalar 10, you will need to tweak the PPT, TDC and EDC settings. If opting for a lower Scalar PPT, TDC and EDC can be left on Auto or maxed out.

• Precision Boost Overdrive: Set to manual to adjust settings.
• PPT Limit: The maximum for your motherboard by simple entering 99999 it will autocorrect to the maximum value for your particular motherboard.
  Manual settings for PPT: set a value of 100 ~ 125.
• TDC Limit: The maximum for your motherboard by simple entering 99999 it will autocorrect to the maximum value for your particular motherboard.
  Manual settings for TDC: set a value of 60 ~75.
• EDC Limit: The maximum for your motherboard by simple entering 99999 it will autocorrect to the maximum value for your particular motherboard.
  Manual settings for EDC: set a value of 80 ~ 115.
• Precision Boost Overdrive Scalar: Increase the maximum boost voltage and time when using that particular boost value. For this motherboard Scalar, 10 was used with manually tweaked settings.
• Custom Precision Boost Overdrive Scalar: Scalar multiplier use a value of 7 or less.
  The Scalar value of 10 to achieve higher Mhz, but this must be reign in with custom PPT, TDC and, EDC values. Use a lower or auto Scalar if having PPT, TDC and, EDC set to Auto.
• Max CPU Boost Clock Override: Maximum value for Core Boost use the highest setting.
• Platform Thermal Throttle Limit: Set to Manual.
• Platform Thermal Throttle Limit*: Set to thermal value in Celcius, use 80 ~ 90.

 The image below is an example profile of the 3700X running a base PBO 2.0 profile reaching 4.35 GHz max all cores and under sustained load with Prime95 Small FFT's 4.20 GHz all cores. And a max single core of 4.425 GHz single-core with Prime95 Small FFT's.

A feature on the ASUS motherboard is the Fmax Enhancer by The Stilt this helps single-core performance. It can be enabled in the normal PBO menu as highlighted below.

 With some further tweaks, some more gains could be made, but those gains were minimal. 4.35 GHz max all-core with a sustained all core max of 4.3 GHz. And a max of 4.475 GHz in single-core. This also might be because of the limitation of the VRM on a B450 motherboard so X470 or X570 motherboard results should be far better. Another option here is to tweak the VRM settings as would normally apply when manually overclocking. The Digi+ VRM settings below covers that more in-depth to squeeze just a bit more performance out of your AMD 3700X.