Elitebook 840 G6 - low cpu performance & throttling

[demorez]

I have an Elitebook G6 with an i5-8265U CPU. My problem is that the system is running very slow, even after a fresh reinstall. I have run Cinebench and compared the results with a Probook 440 G5 G6 with the same CPU, that shows 50% higher results in Cinebench.

I have installed Intel XTU to check the cpu power limits and run a few benchmarks. The CPU power settings are the same on the Elitebook and Probook, yet the performance is very different.

Heres a screenshot from XTU https://imgur.com/a/orRxaHE

CPU temp is normal, the CPU is idling, yet there seems to be an almost continuos PL throttling for an unknown reason.

Any idea what is causing the problem?

[soccer_dan]

cinebench is very graphics intensive benchmark... did you try updating the BIOS and drivers? try using HP Image Assistant... in addition, you would need to compare the graphics between the 2 laptops... does the 440 g5 have a discrete graphics card? do they both have the same amount of RAM? having less RAM would make the application be swapping to the disk more using virtual disk space... 

[demorez]

they have the exact same config. also using both computers feels entirely different. the probook boots in a breeze, the elitebook takes like 5x longer. a simple task on the probook like scrolling trough an excel with a few thousand lines feels extremely choppy.

also, the probook is a g6, not 5 as i stated above by mistake