Is there any software to manually set my CPU speed?

Yes. There's a great free open source software, and it's called SpeedswitchXP

This software enables you to force the CPU to run at the lowest speed when doing light processing (for longer battery life.) Or force maximum speed for doing heavy gaming (for better performance). And almost everything in between is possible.

Another popular option is RMClock Utility

This utility allows the user to fine-tune various P-States (performance states) and the associated voltage levels. The maximum and minimum FID and VID can also be set so that the processor bound to a range of frequencies and/or voltages.


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