How does UNDERvolting something give MORE power?

i dont kow

good question

>>105880259 (OP)

is zone more power will not do any good any less it wont run at all

by lowering the temperature you tell the boost algorithim to boost higher. higher clock means more power. you only get LESS power if you set a limit somewhere either clock,ppt,tdc,edc,etc.

>>105880259 (OP)
It doesn't, it only increases the ratio of power used for computation to power released as heat.

>>105880259 (OP)
Because modern CPUs Boost according to temps.
If you lower the Vcc, you lower the themps and the CPU can boost higher or longer.
Additionally, manufacturers don't finetune every CPU to it's limits but give mainboard manufacturers ranges of Vcc that every CPU needs. The silicon can oftentimes handle lower voltages, but that's up to you to find out.

>>105880259 (OP)
stock gives more power than actually needed with some extra reserve to ensure 100% rock-solid stability taking into account manufacturing margin of error
since stock gives more power - it heats up faster and hits the thermal wall faster
with undervolting you are de-facto searching for absolute bare minimum power that is necessary for you're specific cpu die to be 99,999% or 100% stable
since you are sending less power - it heat's up slower, and that formed thermal headroom is then used to boost clock higher, because boost potential is locked by thermals

>>105880259 (OP)
It doesn't, it gives less power. Undervolting decreases the voltage swing needed to change state (which makes transitions faster) and reduces the power consumed (which reduces heating). If your chip can run at a lower voltage then it's a straight advantage to undervolt