Turbo Boost not working, Performance is limited

[atsm_zb_g8]

My Laptop specs are
HW: ZBook Fury G8, i7-11850h vPRO, A4000GPU, 64GB DDR4-3200
OS: Windows 10 64b with all updates completed, all drivers installed through HP support assistant tool.
BIOS: Version T95 1.20.0, reset to default factory settings.

PROBLEM: Turbo Boost not working. The CPU performance is limited, clock would occassionally shoot to 3.4GHz or something for a second but mostly they are around 2.4GHz.
When stress testing using cinebench r23 multi-core, the clocks settle at 2.2GHz. The CPU temps are around 60C and fans as normal speeds.
The Cinebench R23 multi-core scores 7436 which is much lower than ~12000 seen for the same CPU. Overall CPU performance seems slightly sluggish. My main concern is CPU performance for what I have bought this laptop.

Using the CPUID tool, I found max TDP=45W.

Using HP Performance Advisor Config report: The Min clock is 1.5GHz, Max is 4.8GHz and Nominal is 2.5GHz
Using HWinfo tool: PL1 and PL2 limits are both 35W (dynamic)
What I tried so far: 
- Make sure Turbo Boost is enabled in BIOS

- Windows 10 power plan set to High Performance.

- Power adapter plugged in, battery at max

- Re-installed a clean windows 10, all drivers and updates completed

A few months ago, the warranty expired so HP customer support won't help. I can provide any more info needed. Any pointers to the solution would be highly appreciated :-). Thanks in advance.

[Jupitero]

Hello.

HP may have set some conservative power settings in BIOS.

Download and install the Intel Extreme Tuning Utility 7.14.2.14 from Intel website. Set Turbo Boost Short Power Max (PL2) and the Turbo Boost Power Max (PL1) both to 45W and the Turbo Boost Power Time Windows to 128 seconds (=max).

Run Cinebench again and report here.

[atsm_zb_g8]

Hi @Jupitero, Thank you so much for your response. I setup the Intel XTU as per guidelines. Please find the screenshots attached. However, the problem still persists and the cinebench r23 score is same as before.

However, I did notice one thing, (in the second screenshot, HWinfo performance limit reasons) it says performance limited by electrical design. I am using 200W power adapter as recommended by HP, should I be looking for something? Is there a way to verify the power adapter advertised as 200W is actually 200W? or if there is a way to figure out the power adapter is recognized and supported by the system? I'm just under the impression if power adapter is the culprit here but again I could be misjudging..
Thanks again for your kind response.

[atsm_zb_g8 · Accepted solution]

================= SOLUTION ====================
So, I ran the System Diagnostics (press ESC on power up) and got to Power Tests>AC Adapter Tests, the result was

WARNING: The AC adapter power rating is below required, System is operating on reduced performance ................

I was using HP 200W power adapter but was a bit older *perhaps a chinese replica or something.
I got the officially recommended 200W power adapter, Model Number L00818-850 and everything worked like a charm. Turbo boost works now and the benchmarks are at par. Everything is fine

[Jupitero]

Hi,

this is excellent news and I commend you for coming up with the solution AND writing the followup message here for others who may face the same problem!