It may be possible, however, it's generally not recommended due to too many factors that could go wrong in the process.
Since your laptop is gaming oriented, I would do some research and see if it's possible to swap out the CPU. I know some gaming laptops are fully capable of swapping out components, so you may be lucky
Generally no. Laptops are usually custom made with a certain chip in mind and the bios generally only supports that chip. Even if it may support higher clocked / better chips, the actual laptop cooling system may not even by sufficient to get rid of the heat.