My CPU is not working at its full potential while playing games please tell me a fix

[GTAONLINE]

My cpu runs at it's full speed when doing normal tasks,

But when i play games it locks at 1.6ghz it's so frustrating

this problem came out when i reinstalled windows

I have been looking out for this since 8 days but I could not find any solution.

Please help me ��������


my specs--

Device name INSPIRON I5R 5537

Processor Intel(R) Core(TM) i5-4200U CPU @ 1.60GHz 2.29 GHz

Installed RAM 12.0 GB (11.9 GB usable)

System type 64-bit operating system, x64-based processor

gpu- Amd radoen hd 8670m 4gb

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