Better performance on Zen 3 AMD CPU

I was recently looking at undervolting my CPU as I'd seen this great video from Optimum Tech on youtube.

After following the basic guide and tweaking the undervolt as discussed in the aforementioned video I gained lots of performance, for example using the basic benchmarking tool built into CPUZ I'd gained over 20% performance from this single tweak alone.

My understanding is that with precision boost overdrive by reducing the voltage / power consumption the processor works until it reaches the same level of power consumption and temperature as before.