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Intel i5 3230m not reaching max TDP (HP probook)

HP Recommended
HP probook 6470b
Microsoft Windows 7 (64-bit)

Hello everyone,
I had an issue with my laptop i5 3230m (official TDP 35W) CPU TDP.

Laptop model: HP probook 6470b. Using genuine HP new smart adapter.
OS: Windows 7 64 (last update included).
Software for system info: HWMonitor (v.1.35).
Software for system stress: Prime95 (last version for 64 system).

Symptoms: Observing that TDP never go beyond 20W (for package).

What I've tried: To see if there any power options in Windows to change. I've put CPU on max everywhere in Windows power management.
Installed "Intel Extreme Tuning Utility" to see if there any options to enable/disable. All was OK.

I have also another laptop with 4710MQ CPU. And same software for monitor and stress show results in accordance to Intel TDP data (long term and short term TDP).

If any one had similar problems with any laptop or HP probook series can you confirm my output results? I want to know if it's probably related to manufacturer limiting somehow TDP (CPU consumption in this case). Or it could be related to software problem (Windows? Drivers? etc?).

And yes I know what does TDP means. But how I understand TDP shown in HWMonitor signify power consumption and not related to how much heat should be dissipated by cooling system.

Thank you.

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