Hello and welcome chippo1992. If you wanted to know if you could upgrade the CPU, it's unlikely since this was used on entry level laptops. This CPU came out around 2013/2014 and most laptops had those integrated on the boards if I'm not mistaken. You will most likely have to look for a faster (newer) device.
If you meant to ask which processor would specifically be between 2.5 - 3.3GHz, you have a lot of options but again, it depends on your budget and what's available in your area. If it needs to be a laptop, look for the following CPUs AMD FX7500, or AMD A10-8700P from Asus, Lenovo, and HP - just as an example.
1. MHz doesnt say ANYTHING -> we need to know what you want to do with it
2. Notebook or Desktop?
It sounds like you'd need to bump up to an A10 chip notebook which would carry the R7 GPU.
What type of work are you doing so that we may better help you?