@chipimaurino
The 8750H has a 45W TDP power rating. Most laptop manufacturers decided to set the long term PL1 turbo power limit equal to the 45W TDP value. During a full load stress test like Cinebench, this forces the CPU to slow down to prevent power consumption from exceeding 45W. ThrottleStop is correctly showing that your computer is power limit throttling.
During your Cinebench test, the main screen of ThrottleStop shows POWER in red which indicates power limit throttling. The CORE column of the Limit Reasons window confirms that PL1 is the reason for throttling. If you look at the top of the TPL window, the MSR PL1 and MMIO PL1 power limits are both set to 45W. At default settings, your CPU is doing exactly what it was designed to do. Throttle right at 45W.
Your laptop seems to have better than average cooling. If you want, you can try using ThrottleStop to increase the turbo power limits. If this works it will increase power consumption which will increase heat. Some laptop owners consider increasing the power limits to be overclocking and are not interested in increasing the power limits.
If you want to do some testing, check the MMIO Lock box, clear the Disable Controls box and change Long Power PL1 from 45 to 60. Press OK and run Cinebench again to see if it makes any difference. Some laptops are set internally to a long term maximum of 45 Watts. Run another Cinebench test and watch the main screen of ThrottleStop. Does power limit throttling occur at 45W or has this limit been bypassed? If you are still being limited to 45W then you cannot use ThrottleStop to exceed this long term power limit.
If 60 works better during Cinebench, you can try 70 or 80. At some point you might end up with thermal throttling instead of power limit throttling.
Most people use ThrottleStop to undervolt their CPUs. Undervolting reduces power consumption which allows the CPU to run faster. At default settings, the long term 45W power budget allows your CPU to use an average multiplier of 27.95 while running Cinebench. If you lower the voltage, the CPU will be able to run faster while staying within the same 45W power budget. If it was my laptop I would do both. Decrease the voltage and try increasing the PL1 power limit.
There are lots of YouTube videos available that show how to use ThrottleStop to undervolt. A good place to start testing is with the core and the cache set to a negative offset voltage of -100 mV for both. If you try to undervolt too much, worst case, your computer will crash and you will have to restart it. The BIOS should automatically reset all of the voltages to default values. If you saved some voltages to ThrottleStop that were not stable, after you reboot, delete the ThrottleStop.INI configuration file before starting ThrottleStop. Doing this tells ThrottleStop not to apply voltages when you start up. You already know the voltages you were trying to use were not stable. That is why your computer crashed to no need to try those same voltages again.
Many 8750H are 100% stable with the cache set to a negative offset of -125 mV and the core set to -175 mV. Every CPU is unique so if you are going to undervolt, be prepared to do some stability testing. The built in TS Bench 960M test is a good basic stability test. If the TS Bench reports any errors, stop the test and increase the voltage. Errors in any test are a sign that your CPU needs more voltage.
The FIVR window should look like this when you request a negative -100.6 mV offset for the core. The CPU Cache should look the same as this window. The Intel GPU, iGPU Unslice and the System Agent are not as important. Most people only undervolt the core and the cache.
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