Clarification regarding my CPU usage

Good day to you!
Please guide me…
I have a question regarding my CPU usage. I am planning to build a computer that is suitable for gaming and I would need Intel i3-2120 and a frequency of 3.3GHz. At the moment, I already have Intel i3 M330 and a frequency of 2.13GHz. Whenever I use it, my Task Manager indicates that my CPU usage is around 60-70%.
My question is should I be able to build a gaming PC with Intel i3-2120, would my CPU usage still be around 60-70%?
My laptop also integrates graphics allowing the graphics to be discrete. I was wondering if this also affects the CPU usage.
I hope you can help me with this concern.
Thank you.
