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.

When I say "boosting higher and longer," I'm referring to how modern CPUs dynamically adjust their clock speeds. With less voltage needed, my CPU can now reach higher frequencies while staying within the same power/thermal envelope.

It's like giving the processor extra headroom to perform. For example, instead of hitting 90°C and throttling back at 4.2GHz, it might now reach 4.4GHz before hitting that same temperature limit. Also, during extended workloads like rendering or gaming, the CPU can maintain elevated clock speeds for longer periods before thermal throttling kicks in. This explains the significant benchmark improvements I've seen.