@Klaudia233 - Your screenshot shows PROCHOT 95°C lit up in red. That means your CPU is running hot and thermal throttling which slows it down. You might want to consider replacing the thermal paste. You cannot make your CPU run any faster if it is thermal throttling.
You do not need to set the core and cache voltages equally. Try leaving the cache at -90 mV, run Cinebench R20 and see if changing only the core offset voltages makes a difference to performance or temperatures.
Baseline -90 mV for core and cache.
-90 mV for cache and -110 mV for core.
-90 mV for cache and -130 mV for core.
Not sure about your U CPU. Many of the H series CPUs will benefit from setting the core to a much bigger number compared to the cache. R20 is the best program to test this. Do not use Cinebench R15 or some other program.
When testing with R20, open up Limit Reasons. What is lighting up in red? Is it power limit throttling holding you back or thermal throttling or something else?
