Gt780dx CPU drops clock speed

Hi, i have gtx460m installed, and 344.75 nvidia drivers. So i start a game to play and framerates are acceptable, but suddenly they drop low to 15-20
So i searched for what happens, abd i found out that the cpu drops from 2600 to 800 mhz.
I have the laptop to power supply, and changed the power to high, like im doing to desktop pc, but didnt fix it.
It still drops to 800mhz

Well, your CPU shouldn't be running at 800 MHz....that's for sure. It helps explain WHY the GPU isn't functioning properly.
What I would try first....is go into your control panel -> Power options -> click on the Change Plan Settings for the current plan that is in use -> "Change advanced power settings" -> scroll down to "Processor power management" -> Maximum processor state -> and change both from 100% to 99%.
Reboot.
Play a game with CPU-Z and MSI Afterburner running and see if it is fixed.
If it is not, then I would go back and change it from 99% to 100% again and we'll have to figure something else out to try.
(All this is really doing is disabling the 'turbo mode' of the CPU and restricting how fast it can run)

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